Abstract: Based on the static life table of population and the theory of survival analysis, studies were made of the structure and quantitative dynamic characteristics of Cercidiphyllum japonicum populations by using the method of survival function analysis in Tangjiahe Nature Reserve. The results showed that (1) the age structures of C. japonicum populations were like a pyramidal shape, and the number of younger individuals was relative less, while that of mid and older individuals was relative greater; (2) There was a similar variation trend in population mortality and vanishing rate curve, and the peak value appeared in the second age-class, which indicated the seedling mortality was higher, and the survival curve of population tended to be Deevey-type Ⅱ. (3) The population size of these populations would decrease sharply in the early stage, become relatively stable in the middle and late stages, and gradually decline in the last stage. The populations were in the early stage of decline at present.