Abstract: The systematic full scale tests in situ were carried out to determine the behaviour, function and bearing capacity of cement stabilized soil pile composite foundation in soft soil. The pressure under cap,axis force along pile and deformation of foundation were obtained from these tests. The bearing capacity and deformation of fourpile and ninepile composite foundation were systematically analyzed based on part of the test results.The influences of length,spacing and number at pile on bearing capacity and deformation module of cement stabilized soil pile composite foundation are studied.