English：

Based on the No. 1 tower of Longhua Zhangkengjing project in Shenzhen, the concretemodularization technology and the formwork shell shear wall system are systematically introduced, and theinfluence of the formwork shell on the structural stiffness is studied. The natural vibration period, inter-story displacement angle and base shear force of model 1 ( the thickness of shear wall is 200mm thickcast-in-place layer + formwork shell) and model 2 ( the thickness of shear wall is 200mm thick cast-in-place layer) are analyzed and compared. The results show that the increase of structural stiffness byformwork shell is within 10%, and it is reasonable and feasible to adopt the period reduction coefficient of0.8 in the design.