Taking mechanical and electrical properties of PV modules with different fixed spacing on trackers as the research subject,the feasibility of the two fixed spacing schemes is confirmed in the design and construction of the project by the measured deflection,power attenuation and indistinct cracks from TUV institute test. Furthermore,combining the theory of finite element and ANSYS software,the finite element model of the PV module is established,and the guideposts of the calculation result is proposed after the rationality of the model is proved by comparison between numerical simulation result and measured date. The model which can make a security assessment of the mechanical and electrical properties about PV module is significant for security and cost control of project.