The spaceborne low Passive Intermodulation(PIM) feed is designed for some type of high-power feed product. The simulation analysis method and the test results are given in detail. The proposed design utilizes choke flange with low PIM to depress the conduction current with third-order intermodulation frequency on the joint face in order to reduce the product of PIM, and the PIM value can be decreased by more than 40 dB. To decrease PIM for other non-third-order frequencies, the pressure of flange can be enhanced. The performance is compared with those of similar foreign products, which fully shows the validity of the design and its technical level.