The Asian Football Confederation was allocated four and half qualifying berths for the 2002 FIFA World Cup, South Korea and Japan, the co-hosts, qualified automatically, leaving two and half spots open for competition between 40 teams. Myanmar withdrew from the tournament after being placed in Group 2 but before any matches had been played, therefore reducing the group to 3 teams.
Asia's two remaining automatic qualifying berths were taken by Saudi Arabia and China.
Iran defeated United Arab Emirates for the chance to become the possible fifth Asian qualifier, but lost to Ireland in the intercontinental play-off.
Tournament structure
There were three rounds of play:
First Stage: The 39 teams were divided into 9 groups of 4 teams each, and 1 group of 3 teams. The teams played against each other twice, except in Group 2, where the teams played against each other once. The group winners would advance to the Final Round.
Second Stage: The 10 teams were divided into 2 groups of 5 teams. The teams played against each other on a home-and-away basis. The group winners would qualify. The runners-up would advance to the AFC Play-off.
Play-off: The 2 teams played against each other on a home-and-away basis. The winner would advance to the UEFA/AFC Intercontinental Play-off.