Huang-Lao or Huanglao (simplified Chinese: 黄老; traditional Chinese: 黃老; pinyin: Huáng-Lǎo; Wade–Giles: Huang-Lao; literally: "Yellow [Emperor] Old [Master]") was the most influential Chinese school of thought in the early 2nd-century BCE Han dynasty, and is generally interpreted as encompassing Daoism and Legalism. Excepting the Huangdi Neijing, most Huang-Lao texts have vanished, and traditional scholarship associates this philosophical school with Chinese classics such as Xunzi, Hanfeizi, and Huainanzi. Modern scholars are reinterpreting Huang-Lao following the 1973 discovery of the Mawangdui Silk Texts, which included four manuscripts, called the Huang-Lao boshu (黄老帛书 "Huang-Lao Silk Texts"), that are controversially identified as the long-lost Huangdi Sijing ("Yellow Emperor's Four Classics").
The term Huang-Lao first appears in the (109 – 91 BCE) Records of the Grand Historian, which was begun by Sima Tan and completed by his son Sima Qian. Sima Tan studied under a Huang-Lao master, with a philosophical lineage dating back to the Warring States period Jixia Academy at the court of Qi (modern Shandong).
The related Daoist name Huanglao jun (simplified Chinese: 黄老君; traditional Chinese: 黃老君; pinyin: Huánglǎojūn; Wade–Giles: Huang-Lao-Chun; literally: "Yellow Old Lord") was a deification of Laozi and a reincarnated personification of the Dao.
Huang-Lao Daoist philosophy was favored at the Western Han courts of Emperor Wen (r. 180 – 157 BCE) and Emperor Jing (r. 157 – 141 BCE), before Emperor Wu (r. 141– 87 BCE) established Confucianism as the state philosophy. 
Hans van Ess (1993:173) analyzed the Shiji and Hanshu biographies of 2nd-century BCE individuals described as "Huang-Lao" followers, and found they were either members of a Huang-Lao faction or a Ru "Confucian" and Fa "Legalist" faction. Thus, the historian Sima Qian used the term Huang-Lao "as a characterization of persons belonging to a political group which was the faction he belonged to as well." These historical members of the Huang-Lao faction had three political policies in common: "opposing the campaigns in the north" against the Xiongnu, "affiliation to rich and independent families with a power-base far from the capital" at Chang'an, and "opposing the measures to deprive the feudal kings of their power."
The Huang-Lao was probably the earliest movement that linked together Laozi, Zhuangzi, the worship of Huangdi, the School of Naturalists, elements of Chinese folk religion, and aspects from the other Hundred Schools of Thought. These would be the raw ingredients of Taoism.
During the Eastern Han period, the Way of the Celestial Masters movement incorporated Daoist immortality techniques with Huang-Lao thought, and was associated with the Yellow Turban Rebellion and Five Pecks of Rice Rebellion (184 – 215 CE). "Later on, virtually all of the early texts disappeared and knowledge about original Huang-Lao was lost." (Yates 2008:508)
Huang-Lao thought influenced many prominent Chinese philosophers and officials from the fourth through second centuries BCE.
Some representative thinkers include Shen Buhai (c. 400 – 337 BCE), Shen Dao (c. 360 – c. 285 BCE), Confucian Xunzi (c. 335 – c. 238 BCE), Mohist Song Xian (c. 334 – 301 BCE), naturalist Zou Yan (c. 305 – c. 240 BCE), and Legalist Han Feizi (c. 280 – c. 233 BCE). Two influential ministers of Emperor Gaozu of Han reportedly studied and applied Huang-Lao political ideology, Chancellors Cao Shen (d. 190 BCE) and his successor Chen Ping (d. 178 BCE) employed the policy of wuwei ("inaction") and brought peace and stability to the state of Qi (van Ess 1993:163). Chao Cuo (d. 154 BCE), Chancellor to Emperor Jing, was another Huang-Lao official. He believed that the imperial rule should combine Huang-Lao and Confucianism, with punishment supplemented by reward, and coercion mitigated by persuasion. (Fu 1993:49)
Scholars have identified various Huang-Lao writings in the Chinese classics. Proposals include parts of the Daoist Zhuangzi (Schwartz 1985:216), the syncretic Huainanzi (Major 1983:8-14 and 43-53), sections of the historical Guoyu ("Discourses of the States"), Chunqiu Fanlu ("Luxuriant Dew of the Spring and Autumn Annals"), and Lüshi Chunqiu ("Mister Lü's Spring and Autumn Annals"), the Heguanzi (鶴冠子 "Book of Master Pheasant-Cap"), and the military Huang Shigong San Lüe ("Three Strategies of Huang Shigong"). Randall P. Peerenboom (1990) criticizes the tendency to classify all these texts together and "make of "Huang-Lao" a dustbin by sweeping too much into it."
Besides these received texts, the imperial library bibliography preserved in the (111 CE) Hanshu ("Han History") lists many books titled with the Yellow Emperor's name. However, with the exception of the medical Huangdi Neijing ("Yellow Emperor's Internal Classic"), all were believed destroyed or lost – until the recent Mawangdui discoveries.
Mawangdui silk texts
Silk manuscripts found in Mawangdui tomb number three, dated 186 BCE, included two versions of the Daodejing, one of which ("B" or yi 乙) had copies of four texts attached in front. They are titled (tr. Peerenboom 1993:6) Jingfa (經法 "Canonical Laws" or "Standards of Regularity"), Shiliujing (十六經 "Sixteen Classics", also read as Shidajing 十大經 "Ten Great Classics"), Cheng (稱 "Weighing by the Scales", a collection of aphorisms), and Yuandao (原道 "Origins of the Way", also the title of Huainanzi chapter 1).
Some Chinese specialists, such as Tang Lan (唐兰, 1975) and Yu Mingguang (余明光, 1993), interpreted these four manuscripts as the no longer extant Huangdi Sijing (黃帝四經 "Yellow Emperor's Four Classics"), which the Yiwenzhi (藝文志) bibliography of the Hanshu listed as having four sections. Tang's reasons included the Jingfa and Shiliujing titles with jing (經 "classic; canon") and the frequent references to Huangdi ("Yellow Emperor") in the Shiliujing.
Other specialists, such as Robin Yates (1997) and Edmund Ryden (1997), interpreted the four manuscripts as mutually incompatible texts deriving from diverse philosophical traditions. Paola Carrozza (2002:61) refers to this approach as "different authors, different times, and different places."
Consequently, many of the interpretations of the nature and characteristics of Huang-Lao Taoist thought that have been based on a reading of the Mawangdui manuscripts are debatable, since they are based on the assumption that these texts form an integral whole and are really affiliated with Huang-Lao. (Yates 2008:509)
Sinologists have long disputed the nature of Huang-Lao philosophy. Before the 1973 Mawangdui excavation, some western interpretations of Huang-Lao were fanciful. For instance, Herbert J. Allen (1906:268) proposed that since Han prince Liu Ying practiced both Huang-Lao and Buddhism, Huang-Lao did not mean Huangdi and Laozi, but "Buddhists (literally Yellow-Ancients, perhaps so-called from the colour of their garments)." Following the Mawangdui discoveries, the "Huang-Lao craze" (Roth 1997:300) in scholarship has significantly reshaped our understanding of early Daoism.
Tu Wei-Ming (1979:102-108) describes five common doctrines in the Huang-Lao silk texts. Dao (道 "way; path") is the ultimate basis for fa (法 "model; law") and li (理 "pattern; principle") essential for sagely governance. The true king uses guan (觀 "see; observe; contemplate") or "penetrating insight" to observe the inner workings of the universe, and cheng (稱 "balance; scale; steelyard") enables timely responses to the challenges of the world. Loewe (1999:986-7) lists another principal idea of the Huang-Lao silk texts: xingming (刑名 "forms and names"), which is usually associated with Shen Buhai. Xing ("form or reality") exist first and should be followed by their ming ("name or description").
Our limited exposure to the "lost texts" in the Silk Manuscripts seems to indicate that the thought of Huang-Lao contains several apparently unrelated but actually fully integrated philosophical concepts: a cosmological vision of the Way (tao) as the primordial source of inspiration; an administrative technique (fa-li), based on the principle and model of the naturalness of the Way; a concern for the cultivation of penetrating insight (kuan), so that a king could reign without imposing his limited, self-centered view on the order of things originally manifested in nature; and the necessity of attaining a kind of dynamic balancing (ch'eng) in order to ensure a steady flow, as it were, of the political system as a mirror image of the cosmos. (1979:108)
Tu (1979:107) concludes, "The Huang-Lao doctrine is neither Taoist nor Legalist in the conventional sense, nor is it, strictly speaking, a form of Legalized Taoism. It is rather, a unique system of thought."
John S. Major (1983:12) summarizes Huang-Lao ideology. Dao is the "highest and most primary expression of universal potentiality, order, and potency", and "is expressed in cosmic order, which embraces both the world of nature and the human world." Royal government must conform to natural order, thus the king should practice wuwei ("non-striving" or "taking no action contrary to nature") and use his shenming (神明 "penetrating insight") to "learn all that can be learned about the natural order, so as to make his actions conform with it." Therefore, "The government of the true king is neither sentimental nor vacillating, and neither arbitrary nor domineering," it fully conforms with the "pattern of the Dao as expressed in the natural order, it is balanced, moderate, and irresistibly strong."
Randall P. Peerenboom (1990) recaps, "Huang-Lao's Boshu, while advocating a rule of law compatible with an organismic cosmology, is unique in that it supports a natural law grounded in the natural order." Peerenboom (1993:27-31) characterizes Huang-Lao as "foundational naturalism", meaning naturalism based upon a cosmic natural order that includes both the rendao (人道 "way of humans") and tiandao (天道 "way of Heaven"). Huang-Lao ideology gives "normative priority" to the natural order, with human social order based upon and in harmony with the cosmic order.
Jeffrey L. Richey (2006:336-339) contrasts Huang-Lao and Mohist theories about the cosmic roots of fa "law". In the Jingfa, fa originates with the impersonal Dao; in the Mozi, it originates with the anthropomorphic Tian ("heaven; god").
Harold D. Roth (1991, 1997) contends that the original meaning of Chinese Daojia (道家 "Daoism") was Huang-Lao instead of the traditional understanding as "Lao-Zhuang" (老莊, namely the Laozi and Zhuangzi texts) Daoism. Sima Tan coined the term Daojia in his Shiji summary of the six philosophical jia ("schools").
The Taoist school enables man's numinous essence to be concentrated and unified, to move in unison with the formless, and to provide adequately for the myriad things. As for its methods, it follows the general tendency of the Naturalists (Yinyang chia), picks out the best of the Confucians and Mohists, and adopts the essentials of the Terminologists (Ming-chia) and Legalists. It shifts with the times and changes in response to things; and in establishing customs and in practical applications it is nowhere unsuitable. The general drift of its teaching is simple and easy to hold onto, much is achieved with little effort. (tr. Roth 1991:605)
Thus, Huang-Lao Daoism incorporated concepts from five traditions: School of Naturalists, Confucianism, Mohism, School of Names, and Legalism. Roth (2004:8) describes the hallmarks of Huang-Lao: the ruler should use self-transformation "as a technique of government, the emphasis on the precise coordination of the political and cosmic orders by the thus-enlightened ruler, and a syncretic social and political philosophy that borrows relevant ideas from the earlier Legalist and the Confucian schools while retaining the Taoist cosmological context."
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