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Formalized description of the complicated system has the extremely vital role to design the new system, improve and evaluate the existed system. A detailed DSPN(Deterministic and Stochastic Petri Net) model and performance analysis of fault-tolerant real-time hybrid task scheduling in processor system is presented in this paper. Firstly, the tasks are divided into four kinds based on their priority, period, fault tolerance and real-time. Secondly, the behavior of scheduling execution of tasks, preempting resource of the higher priority tasks, interrupting and resuming of tasks, occurring and recovering of failure in processor system is accurately described by DSPN, and then the model of fault-tolerant real-time task scheduling of processor is constructed. Finally, the simulation results demonstrate that the utilization of processor is same at the same load, and the fault-tolerant real-time task scheduling algorithm can effectively reduce the task miss ratio. The DSPN model constructed can analyze the quantitative performance metrics of the fault-tolerant real-time task scheduling, which not only will be useful for constructing the Petri net model for complex processor system, but also be helpful for engineers and researchers.