In order to solve the problem that there isn't a set of design method and its optimization strategy in the virtual synchronous generator technology, this paper introduces Professor Qing-Chang Zhong's Synchronverters Technology, and comes up with a complete parameter design method and its optimization strategy of virtual synchronous generator. Because different parameters have different effects on system response, it applies variable control method, changes the value of damping coefficient Dp, Moment of inertia J, the voltage dropping coefficient DQ and integral coefficient K respectively and performs simulation experiments. The above four parameters are optimized and the physical meanings of the time constants τfand τv are revealed by judging and analyzing the overshoot and response speed of system response when the virtual synchronous generator is in the off-grid state and the grid synchronization process. Experiments show that the proposed design method and optimization strategy can quickly and accurately select the most appropriate parameters with good practicality. This work is supported by National Natural Science Foundation of China (No. 51307126).