The invention discloses a software protection method based on generating a dynamic code in a safe environment in the process of running. By immediately generating a code relevant to a non-safe running environment in the safe environment and running the generated code in the non-safe running environment, the difficulty of debugging and analysis of software is improved, and performance loss due to the fact that the code runs in the safe environment is avoided. The method is basically free of performance loss, can provide high safety, and has quite large practical value.