Abstract: With the technology of integrated circuits entering into nanometer regime, circuit aging continuously exacerbated, which brings prominent challenges to the reliability of multi-processor system-on-chip（MPSoC）. Regarding to the problem that existing solutions for heterogeneous MPSoC reliability enhancement haven’t taken account of reliability diversity among processors, a task scheduling algorithm considering reliability diversity is proposed. To quantify the reliability diversity among the processors within heterogeneous MPSo Cs, the algorithm combines with Electromigration-aware mean time to failure（MTTF） model of single processor and a target model is concluded. Based on the target model, a task scheduling algorithm named cross is presented, which reduces the reliability diversity among processors for enhancing overall reliability of heterogeneous MPSoC. Experimental results demonstrated that a reduction of 3.71% in MTTF variation coefficient was achieved by the proposed task scheduling algorithm, compared with the existing workload balancing task scheduling algorithm.