By using nearly 3000 single-tree DBH growth data from multi-stage continuous forest inventory, the unified model for large scales for diameter at breast height of two cypress-tree grown in north subtropical area were established. After adjusted, the determination coefficients of the models were higher than 0.6. Of them, the all-variable model included more forest stand factors, while the easily-used model only included the variables which are easy to get from the terrain and forest form map, thus applying on a large scale more conveniently. The obtained models revealed that the geographic positions and annual mean accumulated temperature played more important roles in annual DBH growth than other factors. These models provide tools for researching ecosystem productivity and effects of climatic changes on ecosystem.