Abstract: In this study, influences of different light qualities (White light, WL; Blue light, BL; Green light, GL; Red light, RL) on the germination processes of carpospores and conchospores of Pyropia haitanensis were investigated. Results showed that compared to those of WL-grown spores, growth and branch formation of germ tubes in carpospores and cell divisions in conchospores were accelerated by GL but retarded by RL and BL. In addition, different light qualities had no significant influence on survival rates of both carpospores and conchospores but apparently causing color changes. Two spores released from sporangia were originally yellowish-brown in color. The germling colors of two spores grown under WL and of the carpospores grown under BL became bright red. Even the color of chonchospores changed into mulberry much obviously under BL in the late stages of the culture. However, all the spores grown under RL and GL were discolored into light yellowished-brown. Results of this study indicated that GL might have negative effects on the pigment accumulation but favored the germination and the germling of carpospores and conchospores.