Abstract: With the development trend of microwave printed circuit (MPC) products towards small volume, light weight, high reliability and high density interconnection （HDI）, it is urgent to advance its manufacturing capability, especially the high precision MPC technology. The material requirements of MPC are simply introduced and the crucial technology of high precision line, high precision alignment and high precision milling are mainly discussed. Samples of spiral antenna, coupler and switch are made and tested to validate the feasibility of technology. The result shows that the high precision MPC technology can not only improve the microwave performance of the existing products, but also make a foundation for development of millimeter wave products.