Abstract: At high temperature, A and B can produce HCl, chloroacetic I can produce hydroxyl chloroacetic acid. We took the A, B and I as the parent acid, deployed a self-generating hydrochloric acid for high-temperature carbonate rock, and studied its performance.At high temperature, the self-generating hydrochloric acid can release hydrogen ion with a concentration of over 3.8 mol/L, effective dissolution rate of over 72%, which has a strong dissolution to carbonate rock reservoir. And the acid rock reaction time is greater than 1 h which can play a role of deep acidification. The dynamic corrosion rate can be controlled in 60 g/m² ·h with N80 carbon steel.Core flow test and scanning electron microscopy experiments verify the acidification of the self-generating hydrochloric acid at high temperature, and the effect of acidification is better than the other's.