In this paper, we use the parameter stability test method to study the dynamic change path of China's inflation rate and find that China's inflation rate sequence has obvious structural transformation characteristics. By using the least squares estimation method with structural transformation point, we obtain the structure of inflation rate in China Transformation point estimation and interval estimation. Combining with the fact of macroeconomic operation in China, we analyze and describe the dynamic process of inflation with structural change characteristics, and give two high inflation intervals since 1984.