The probability calculation of hidden failures has a significant impact on the safety assessment results of the initial airworthiness system. Its computational model has complex and diverse characteristics. How to review the security of these models has become a key issue in model development and airworthiness certification. This paper analyzes the factors influencing hidden failure calculation, proposes the certification elements and key points of the calculation model, and uses the currently widely-used engineering methods and calculation models as an example to evaluate and find safety issues, which can effectively promote the safety level of the aircraft.