The disclosed manufacture technology improvement for hydraulic generator 13. 8KV stator coil comprises: selecting the 5440-1K fast-cured high-intensity mica tape for insulation, prolonging the pad transposition insulation length to beyond 60 units than the last transposition curve; rounding edge to the four edges of first-pressed stator to R1. 5-2; and improving the insulation and anti-corona structure. This invention saves cost, and improves product physical performance, such as the breakdown voltage and voltage resistance.