Abstract: The existed mobile WiMAX network is not dependable enough for service-oriented applications,based on the key technologies of dependable computing,applications analysis,network services,security protocols,error detection and fault tolerance,a new M-WiMAX trusted service system is proposed.Combining with features of mobile WiMAX network,a trusted protocol system is build.It enhances reliability and security of mobile WiMAX network applications.Our experimental results show that this scheme not only has advantages but also has a good reference value.