Abstract: Conbined theoretical analysis with actual tests,a new prediction method (G L PRM) for stand diameter distribution is presented.The method takes the distributed law of different trees in stand as a question of biological interpopulation distribution,and stand diameter distribution is expressed by means of the famous Generalization Logistic equation interpopulation dynamic model.The prediction can be made by the three point recovery and difference restoration.The results proved to be satisfactory after the examination in Cunninghamia lanceolata forest in the north of Fujian province.