The relationship between development of maize "and temperature was studied through stage by stage sowing experiments in the field and simulation experiments in pliytotron.The results show that the rate of leaf appearance was curvilineally related to the mean daily temperature and the number of appearance leaves.Two equations describing these curves were set up on the basis of observations.By applying the relationship between number of appearance leaves and ear development stage, the forecasting of car and tassel development courses can be made.