how do I go from Pudong International Airport to Dapuqiao station using metro taxi is very expensive

By metro, take subway line 2 to Century Avenue Station and then transfer to line 9 to Dapuqiao Station. Aside from that, you can also travel by shuttle bus. Shuttle bus line 3 can take you from the airport to Dapu Road Station and then you can easily walk to Dapuqiao Station.