Abstract: According to the characteristics of complex dissimilar, redundant flight control computer system and the combination of the advantage of static and dynamic reliability modeling, the hierarchical hybrid reliability modeling method(HHRM), which combines reliability block diagram(RBD) and generalized stochastic Petri net(GSPN), was presented. In the case that components of common cause failures exist in the various lowlevel subsystems, the system reliability modeling method was analyzed. The HHRM and GSPN methods were respectively used for the reliability modeling and analysis of the main flybywire flight control computer system of Boeing777. Compared with the dynamic GSPN method, the HHRM method adopted static and dynamic reliability modeling methods and combined the flexibility of statespace models and efficiency of combinatorial models. The state space explosion problem caused by GSPN method is avoided by using hierarchical structure. The results of the two methods show that the HHRM method is feasible, efficient and accurate.