To solve the technological difficulties of squirrel cage asynchronous wind generator (FYS02) with high power density, whose stator uses different multi layer and large section coils and alternative reversal inserting, systematic analysis and optimization of coil production and inserting are implemented. Problems in prototype trial production are settled by innovations of step by step winding, insulation reinforcement of single coil nose, adjustment of expansion equipment program, optimization of coil insulation structure, and optimization of the inserting positioning, which make it possible to successfully complete the mass production. This is an important transition of new structure wind power products from research and development concept to actual output, which establishes a technical foundation for the overseas development of wind power industry.