A dynamic trustiness authentication framework based on the integrity of softwarepsilas behavior is proposed in this paper. The method to extract SIBDS (Software Intended Behaviors Describing Sets) and SBAC (Software Behavior Authentication Code) from the binary executable is introduced. In the framework, when the software begin to run, it should be monitored by SBMC (Software Behavior Monitoring Center), then the real API function invoking sequence will be acquired. The framework uses the software behavior comparison algorithm to verify whether the API invoking sequence gotten from the actual behavior is in accordance with SBAC; thereby the softwarepsilas dynamic trustiness can be detected and guaranteed. The experiment results demonstrate the efficacy of the dynamic trustiness authentication framework.