Abstract: With the development of the Tahe Oil Field, deep and ultra-deep carbonate oil and gas reservoirs have been found and put into development. The formation of a series of unconventional acid liquid system is faced with the problem of fast reaction rate and acid corrosion. In this paper, the self-acid system of the Tahe Oil Field was studied. We made self-acid in laboratory, and tested its temperature tolerance, demulsification, corrosion, acid etched fracture conductivity and rock reaction ability. The results show that the reaction rate is slow, which can improve the efficiency of acid corrosion, increase acid pressure effect, and reduce the corrosion rate of pipes. Laboratory testing results show that the acid can be applied to the reservoirs in the Tahe Oil Field. The application in well TH10270 showed good effects.