Research on forest community dynamics and its correlation with environmental factors have been one of the important topics in ecology. Tree death is a vital aspect of forest community dynamics. Environmental factors play significant roles in tree death; therefore, the correlation between wood death and environmental factors for analysis of forest trends need to be studied. The research was performed in a 20 hm² warm temperate secondary deciduous broadleaved mixed forest dynamics plot to investigate the population quantity characteristic, spatial distribution, and the relationship of the habitat, before and after tree death (before the death:living tree stand; after death:dead tree stand and log). The data were analyzed using point pattern, species-habitat correlation. The results were as follows:(1) Before the death, Quercus mongolica > Betula dahurica > Populus davidiana > Larix principis-rupprechtii. After the death, the order was P. davidiana > B. dahurica > Q. mongolica > L. principis-rupprechtii. Before and after the death, the distribution pattern changed from aggregation to random with the increase in sampling scale. (2) The association analysis of populations and habitats showed that the living standing trees of P. davidiana, B. dahurica, L. principis-rupprechtii were randomly distributed, Q. mongolica were clustered on gentle slopes, there was a higher distribution of P. davidiana and Q. mongolica saplings on the gentle slopes, that of B. dahurica was random, and L. principis-rupprechtii was concentrated on the ridges. There were many steep slopes of fallen P. davidiana, and B. dahurica, and Q. mongolica that were concentrated on the ridge. (3) The spatial pattern of different populations before and after death, appeared to be obvious scale dependence, and were related to the biological characteristics of the species, density constraints, and the process of habitat filtration.