Takeshi Okada
Cao Haiqing started his professional football career in 2011 when he was loaned to Wenzhou Provenza's squad for the 2011 China League Two campaign. He was promoted to Hangzhou Greentown first team squad in 2012 by Takeshi Okada. He made his Super League debut on 27 May 2012 against Henan Jianye, coming on as a substitute for Kim Dong-jin in the 70th minute. Cao became a regular starter in the 2016 season under Hong Myung-bo.