Sea urchins Hemicentrotus pulcherrimus , Glyptocidaris crenularis, Strongylocentrotus nudus and S. intermedius are the most important roe source that export to Japan, S. nudus, S. intermedius and H . pulcherrimus have been cultured and released in north area of China Yellow Sea. This paper deals with the probability of their interspecific hybridization. And their hybrid larvae and juvenile characters were also reported. The results show that water temperature control can make the four sea urchin spawning simultaneously. The percentage of fert ilization in crossing groups was 0- 69. 6% and it was affected by consanguinity relationship of their native stocks and the spawning proper water temperatures of their native stocks. The larvae of H . pulcherrimus .. G. crenularis, G . crenularis .. H . pulcherrimus, H . pulcherrimus .. S . intermedius, S. intermedius .. H . pulcherrimus and H . pulcherrimus .. S . nudus can grow to four..leg larvae, but the abnormal rate was higher, and the development time of f loat larvae was 3- 10 days longer than that of their native stock off springs. Af ter 14 months reared indoor, three hybrid juvenile sea urchins were carried out and their test diameter was 2. 59- 2. 88 cm.