Abstract] The reservoir in La Madian oilfield has the characteristic of thick layers and strong heterogeneity and it is quite different from that of test site. In order to study the feasibility of ASP for thick reservoir, northeast of oilfield was chosen to be the test site of ASP in 2008. The effect of experiment is so obvious that the fall in water ratio is very big and the recovery ratio has been highly enhanced. Analyzing from the situation of oil well and water well profile and the information of oil well emulsification, we can see that under the circumstance of 120m well spacing, the ASP is easy to inject and the fluid production maintains stability.