Three mosses, Rhodobryum giganteum (Schwaegr.) Par., Thuidium cymbifolium (Dozy et Molk.) Dozy et Molk., Mnium lycopodioides Schwaegr., were cultivated in the same environment and their photosynthetic pigment contents 〔total chlorophyll (Chl), chlorophylla (Chla), chlorophyllb (Chlb) and carotenoids (Car)〕 were investigated by the spectrophotometric method. It is found that, under the environmental condition with (18±1)℃ in temperature, 35-37μmol·m^-2s^-1 light intensity and 70%±5% in relative humidity, of three mosses, R. giganteum has the highest photosynthetic pigment contents (Chl 4.852 3 mg·g^-1, Chla 2.828 9 mg·g^-1, Chlb 2.023 4 mg·g^-1 and Car 1.006 6 mg·g^-1), the second is M. lycopodioides (Chl 3.583 7 mg·g^-1, Chla 1.962 6 mg·g^-1, Chlb 1.621 1 mg·g^-1 and Car 0.593 1 mg·g^-1), and T. cymbifolium has the lowest photosynthetic pigment contents (Chl 2.050 2 mg·g^-1, Chla 1.192 6 mg·g^-1, Chlb 0.857 6 mg·g^-1 and Car 0.329 2 mg·g -1).