Abstract: As the energy consumption grows in memory system,Phase Change Random Access Memory (PCRAM) is the most promising candidate to be the alternative of DRAM-based main memory.It appears to great advantages of high scalability,low power consumption and non-volatile.However,the limitation of PCRAM used as main memory is the characteristics of write operation,such as poor endurance,high write energy consumption and high write access latency.This paper proposes a parallel read-before-write XOR-based scheme to improve life time and reduce energy consumption of PCRAM.Comparing with Data Comparison Write and Flip-N-Write scheme,experimental results show that our solution improves the write endurance up to 38% and 19%,reduce the write energy consumption by 28% and 17% on average respectively.