In view of the special requirements of the beam parallelism deviation of the Space-borne corner cube prism, a aperture of 10mm corner cube prism used in the Pina satellite laser ranging cooperation target is introduced as an example: Firstly, through the traditional process to process the moderate size of the corner cube prism; Then, the precise control of the beam parallelism deviation is realized through the Counterweight separator processing; Finally, the small-diameter corner cube prism is processed through the "big to small" process, The final product qualification rate can reach 83%。Practice has proved that this process can overcome the problem that the beam parallelism deviation cannot be accurately controlled and is suitable for the processing of small caliber star-borne angular cone prism.