Abstract: AC-RV drive unit, which is composed of high-powered AC servo-motor and high-precision high-rigidity RV (Rotate Vector) reducer, is the most popular drive mode of new industrial robot.This paper chiefly introduced the project "New AC-RV Drive Unit", which was supported by Shanghai Science and Technology Committee.The paper included background, technical requirements principle and advances of the RV reducer, and the guideline of servo-motor, etc.We also developed an AC servo drive card, which based on ISA bus. Its idea, innovation and realization are presented here.At last, the result is given and its future research work.