This paper describes a method of preparing a high resolution coaxial Ge (Li) detector by using native germanium single crystal. By performing some improvement on techniques

the best result of the coaxial Ge (Li) detector with sensitive volume 78cc has been obtained

the resolution of the divice is 2.0 keV for

60

Co 1.332 MeV γ ray and P/C is 33.6:1. The fabrication techniques of the detectors have been proved to have a feature of a good repeat stability and high production rate.