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In order to solve the problem about poor reliability and poor stability for computer module of rugged blade server,this paper proposes a design method for computer module based on ATCA.The method includes the key techniques such as high performance power circuits design based on redundant -48 V inputs, and high bandwidth data memory circuit design based on ECC DDR2,and high speed data storage based on SATA.After a large number of test and experiment, the new computer module of rugged blade server can stable operation in harsh environment,has made greatly increased in reliability and stability.