The color of Xinjiang green tourmalines is very peculiar. Inorder to learn their color genesis, the authors used various testing means suchas chemical analysis, absorption spectrometry and Mssbauer spectrometry to study the color of green tourmalines. The content of transitional ions in each sample was determined by chemical analysis. Such ions as Fe2+, Ti4+ and Cr3+ affect green tourmalines. Their occupation, ionic category, valence state and action in the absorption spectra were confirmed by absorption spectra.The chemical formulae of tourmalines were calculated on the basis of oxide contents, and the ion occupation was defined by Mssbauer spectra. An integrated utilization of the above three means has led the authors to understand that the color of the green tourmalines is caused by transitional ions in the crystal.