With the system’s complexity increasing, the accident caused by human errors is also increasing, traditional safety analysis methods, such as FTA and FMEA that based on the linear chain of events, can’t identify the system risks caused by human errors. So in this paper we used the system-theoretic process analysis (STPA) method to identify the potential safety risks of the combat aircraft’s IFTF(Integrated Fire, Thrust and Flying) caused by human errors. The paper first built a STAMP model of the combat aircraft’s IFTF, then built the STPA safety analysis model of the combat aircraft’s IFTF. In the end, according to the 5 kinds of accident factors proposed by the paper, identifying the risk factors of the combat aircraft’s IFTF’s UCA(Unsafe Control Action) without involving the safety requirements and constraint. The paper’s results laid a solid foundation for the further safety analysis.