The mineralogical, gemological and spectral characteristics and chemical constituents of all kinds of green nephrite jade from Canada were studied by using slice observation, electron microprobe and infrared spectrum. The results indicate that the main mineral components are tremolite and actinolite, with actinolite being dominant. The green dots of green nephrite jade from Canada are chrome grossular, the black spots are chromite, and the waterlines are advanced tremolite.