Japan already qualified for the 2020 Summer Olympics as the host nation, and do not participate in the qualifying stage.
Format
Of the 47 AFC member associations, a total of 25 AFC member national teams entered the qualifying stage. The format is as follows:[1]
First round: Excluding Japan, the five highest-ranked teams based on the June 2018 FIFA Women's World Rankings – which were Australia, North Korea, China PR, South Korea and Thailand – received byes to the third round. The next two highest-ranked teams – Vietnam and Uzbekistan – received byes to the second round. The remaining 18 teams were drawn into two groups of five teams and two groups of four teams, with the teams also seeded according to their FIFA Rankings. In each group, teams play each other once at a centralised venue. The group winners, runner-ups and two best third placed teams advance to the second round.
Second round: The twelve teams (two teams who entered this round and ten teams from the first round) are drawn into three groups of four teams. In each group, teams play each other once at a centralised venue. The group winners advanced to the third round.
Third round: The eight teams (five teams who entered this round and the group winners from the second round) are drawn into two groups of four teams. In each group, teams play each other once at a centralised venue. The top two teams of each group advance to the final round.
Final round: The group winners play against the runner-ups of the other third round group on a home-and-away basis. The two winners qualify for the Olympic Football Tournament.
Tiebreakers
Teams are ranked according to points (3 points for a win, 1 point for a draw, 0 points for a loss), and if tied on points, the following tiebreaking criteria are applied, in the order given, to determine the rankings:
Goals scored in head-to-head matches among tied teams;
If more than two teams are tied, and after applying all head-to-head criteria above, a subset of teams are still tied, all head-to-head criteria above are reapplied exclusively to this subset of teams;
Goal difference in all group matches;
Goals scored in all group matches;
Penalty shoot-out if only two teams are tied and they met in the last round of the group;
Disciplinary points (yellow card = 1 point, red card as a result of two yellow cards = 3 points, direct red card = 3 points, yellow card followed by direct red card = 4 points);
Drawing of lots.
Draw
The draw for the qualification first round was held on 2 August 2018 at the AFC House in Kuala Lumpur, Malaysia.[1] All first round hosts will be appointed after the draw.
First match(es) will be played on 4 November 2018. Source: Rules for classification: 1) points; 2) goal difference; 3) goals scored; 4) disciplinary points; 5) drawing of lots.
Second round
The second round is scheduled for 1–9 April 2019.[6]