Form design of net can help to improve the opening and capturing quality of the space net system. The form optimization design problem of space net was studied based on small elastic modulus method. Internal force distributed in the net was selected as the optimization objective. The maximum stress state was chosen as the research condition and the rope was given minimum modulus elasticity. The iteration analysis was carried out using the results of deformation as the initial condition. Optimization results show that the internal force distribution of the rope net tends to be more uniform with the increase of the iteration steps. Without changing the premise of net topology structure, the established optimization design and method for the space net configuration optimization design and provides a means of reference.