Abstract: Trusted computing is a new paradigm to improve client security on today’s general architecture platforms and it uses a hardware chip as a key component, called trusted platform module (TPM) to achieve the goal. As there are already many related products on the market, it is very necessary to have conformance testing. However, traditional testing methods and experiences can’t meet the testing requirements in a form that make product evaluation to be precisely and automatically processed by machines. A conformance testing model based on the state machine theory is proposed as a solid foundation for testing correctness. Furthermore, related testing strategies based on specification are proposed in order to deal with the state space explosion problem which is a major obstacle reducing practicality of the state machine theory based testing methods. Automated testing tool is also designed and implemented correspondingly to improve the efficiency and accuracy. The tool can generate test suits automatically based on database and customize testing sequences based on the state graph according to user’s requirements. It can achieve process visualization and testing results for the conformance testing that can be used by future security evaluation on trusted computing platform products.