Through mechanical and electrical installation general contract management practice of Chongqing light rail of the Sha Daduan projects, this paper has explored the mechanical and electrical installation works of the subway.For "more than four" features, the major content management elements, methods and points which contains construction management between general contractor and subcontrator, construction sequence management, joint construction project management, materials and large equipment transportation management, construction quality management, construction safety management and contract administration has analysised.