Abstract: Based ont he geological condition and principle of chemical dynamics, the author simulated the karstification of thermal water in the oilfield, by using DF-05 Type autoclave. The author thinks that 1) there are several factors that control the corrosional degree of a rock: the chemical composition, chemical combination of oil field water, temperature, differential pressure of carbondioxide in the rock itself, and the agitating speed and reaction time etc; 2) in oil field environment, the dolomites subjected to strong corrosion of oil field water may form good hydrocarbon reservoirs.