This thesis is devoted to forming properties of Ⅱ-Ⅵ semiconductor self-assembling quantum dot. We study two factors which are annealing temperature and time respectively to realize how the two factors affect the forming of quantum dots. And then we try to find the best condition of self-assembling quantum dots. Our samples were growth by Hot Wall Epitaxy(HWE). The relations between the forming of quantum dots and the mature period are very closely. It affect the height、density and diameter of our quantum dots. The main purpose of this thesis is to manufacture high density、high quality and high photoluminescence (PL) intensity quantum dots;and then apply to the study of white LED.