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TPCM is an essential part for a trusted computer. How to test and evaluate whether the trusted function can execute in a trusted computer is very significant. A risk assessment model for TPCM based on threat analysis is proposed, which considers comprehensively the essential factors of the information security risk assessment, including the asset, threat and vulnerability of TPCM. The risk computation model is built through analyzing the threat identify, threat consequence attribute and threat index. The risk can be given through the computation of possibility of the threat and their consequence attributes with different weights. By applying the security risk assessment into TPCM, the effectiveness and measurability of the risk assessment process can be improved, which also provides a new approach for the test of the TPCM.