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With The Fast Development Of Cloud Computing And Its Wide Application, Data Security Plays An Important Role In Cloud Computing. This Paper Brought Up A Novel Data Security Strategy Based On Artificial Immune Algorithm On Architecture Of HDFS For Cloud Computing. Firstly, We Explained The Main Factors Influence Data Security In Cloud Environment. Then We Introduce HDFS Architecture, Data Security Model And Put Forward An Improved Security Model For Cloud Computing. In The Third Section, Artificial Immune Algorithm Related With Negative Selection And Dynamic Selection Algorithm That Adopted In Our System And How They Applied To Cloud Computing Are Depicted In Detail. Finally Simulations Are Taken By Two Steps. Former Simulations Are Carried Out To Prove The Performance Of Artificial Immune Algorithm Brought Up In This Paper, The Latter Simulation Are Running On Cloudsim Platform To Testify That Data Security Strategy Based On Artificial Immune Algorithm For Cloud Computing Is Efficient.