Abstract: Because of the safety and economic practicality，the combination support system of soil nailing wall with composite pile-anchor has been more widely used in deep excavation supporting project． In order to do further investigation of the deformation extent of this complex support system in deep excavation construction process，the law of development，and the impact on the surrounding environment，the deformation of the excavation was systematically monitored． Combined with theoretical calculations，a comparative analysis of monitoring data was carried out． A valuable basis was provided for the deformation forecast in the design stage of the support system．