Abstract: By fixing position observition and model sampling investigation the growing law of common chinaff was researched,the results showed that the sprouting rate of common chinaff declines with the lumbering diameter incersing,the average rate is over 90%.The well the site type is original plantation grows,the well the sprout land grows.The site type is over 10 site index.The sprout land grows faster than seedling stand in prophase,but there is hardly and differece from height,diameter,volume.