In this paper, preloaded specimen is used and confined by CFRP to act as structural concrete member in service. And the test to examine the behavior of the test piece has been carried on. After this, the strength and its influence factor has been analyzed. Referring the former strength model, the particular factor axial ratio B of the specimen this test has been taken into account.Then refering the existing model, the improvement has been made. And the new strength model for forecast to CFRP confined preloaded concrete is put forward, also it can be used as reference for reinforcing design of engineering.