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 third Asian qualifier, but lost to Ireland in the inter-continental play-off.
Format
There were three rounds of play:
First round: The 39 teams were divided into nine groups of four teams each, and one group of three teams. The teams played against each other twice, except in group 2, where the teams played against each other once. The group winners advanced to the second round.
Second round: The 10 teams were divided into two groups of five teams. The teams played against each other on a home-and-away basis. The group winners qualified for the World Cup. The runners-up advanced to the AFC play-off.
Play-off: The two teams played against each other on a home-and-away basis. The winner advanced to the UEFA–AFC inter-continental play-off.