Abstract: Under the cycle of natural light , in the two seasons of high temperature and long light and low temperature and short light respect ively, a smal-l type test of about 50d cultivation of the larvae and juvenile abalone of Haliotis diversicolor aquatilis was carried out by means of control over the light intensity. The result of the test shows, the light intensity has an important inf luence on the growth and survival of the larvae and juvenile abalone of Haliotis diversicolor aquatilis who feed on microalgae on substrata, and the most suitable light intensity to abalone larvae and juvenile abalone is 700~ 1200 lx under high temperature and long light, while 1300~ 2000 lx under low temperature and short light. Three groups of test s of the cultivation of larvae and juvenile abalone were carried out one after another by choice of the most suitable light intensity under high temperature and long light and low temperature and short light, and the result similar to that of the smal-l type test has been obtained.