Chemical constituents in essential oil from Campanula colorata Wall. were analyzed by GC-MS technique. The results show that 76 peaks are detected in essential oil from the whole plant of C. colorata and 57 peaks are identified with accounting for 79. 48% of total peak area. Fatty acid ( 19. 38% ) and ester ( 21. 78% ) components are the main components, and there are some sesquiterpenol and monoterpenol components. The constituents with relative content over 2% are 1,2-benzenedicarboxylic acid,butyloctyl ester, cedar camphor, hexadecanoic acid, dibutyl phthalate, tetradecanoic acid, caryophyllene oxide, 6,10,14-trimethyl-2-pentadecanone and spathulenol.