Flexural rigidity of SMW engineering method combination beam is calculated by subentry based on considering interaction of cement soil and shaped steel. Flexural rigidity of SMW engineering method combination beam of elastic stage is obtained. Load-midspan flexivity of SMW engineering method combination beam is deduced under double concentrated force based on energy principle of elastic mechanics. Bending resistance performances of two section forms of SMW engineering method combination beam are analyzed based on above research work. And it is shown that the analysis is consistent with numerical result well.