Abstract: Through crossbreeding of the wild-type(♀) and red-ty pe(♂) P.haitanensis, mosaic thalluses of different colors and fashions were obtained. 4typical strains were selected and individually cultivated. After enzymolysis, integral thalluses with unicolor were obtained. By comparison of their generant types and economic characters, the following results are observed:(1) Mosaic types includered-and-green, red-and-brown-yellow, emerald-and-wild-color and red-and-croci.(2) The mosaic fashion can be divided into spot, strip, draftline, patch, "V" and etc.(3) Agreat difference occurs in the growth of thalluses among various unicolor mosaics. Aremarkable growth speed of length and weight was observed in red mosaic. Forex ample, the thallus with 3~ 4 cm can grow 8.5~ 9 16cm in length and 0.120~ 0.128 g in weight everyday from 11th day to 15th day in labcondition. This type exhibits better heterosis and application prospect in production.(4) Various unicolor mosaics were cultivated in different temperature from 26 to 31℃. Among them, the red mosaic and the green mosaicex hibited stronger capacity in hight emperature. Both of them had punctate rotbut were integrated after cultivated for 10 days in 29℃ and for 6 or 7 days in 30℃. On the contrary, the brown-green mosaic and traditional breed exhibited lower high-temperature resistance, and they would rotted completely after cultivated for 6 days in 26℃. The above results may provide scientific reference for the biological research of Porphyra haitanensis crossbred mosaic and the selective breeding of advantageous strained.