Northern Qiang is composed of several different dialects. Many of which are freely inter-communicable. Sun Hongkai is his book on Qiang in 1981 divides Northern Qiang into the following dialects: Luhua, Mawo, Zhimulin, Weigu, and Yadu. These dialects are located in Heishui County as well as the northern part of Mao County. The Luhua, Mawo, Zhimulin, and Weigu varieties of Northern Qiang are spoken by the Heishui Tibetans. The Mawo dialect is considered to be the prestige dialect by the Heishui Tibetans.
Names seen in the older literature for Northern Qiang dialects include Dzorgai (Sifan), Kortsè (Sifan), Krehchuh, and Thóchú/Thotcu/Thotśu. The last is a place name.
Bradley, David. (1997). Tibeto-Burman languages and classification. In D. Bradley (Ed.), Papers in South East Asian linguistics: Tibeto-Burman languages of the Himalayas (No. 14, pp. 1–71). Canberra: Pacific Linguistics.
LaPolla, Randy J. with Chenglong Huang. 2003. A Grammar of Qiang, with Annotated Texts and Glossary (Mouton Grammar Library). Berlin. Mouton de Gruyter.
Evans, Jonathan P. 2006. Vowel quality in Hongyan Qiang. Language and Linguistics 7.4: 937-960.