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The SaaS multi-tenant data stored in shared schema must be reasonably placed on multiple nodes in cloud environment,to ensure the load balance of the nodes and to reduce the costs by tenants data access and replica consistency update.In respond to these requirements,a SaaS multi-tenant data placement and access model is presented and the corresponding algorithm is proposed.This algorithm introduces a load weighting function and uses the graph theory to obtain the optimal complete subgraph,and further realizes the optimal placement and access for multi-tenant data.Simulation results are provided to demonstrate the correctness and complexity of the proposed algorithm.