We have investigated the dynamics of litterfall production and components using 20 year observation data of litterfall production collected in a successive replanting Cunninghamia lanceolata plantation at the third watershed (No.III) in Huitong National Key Forest Ecosystem Station. Results showed that the successive replanting C. lanceolata plantation started to produce litterfall only at the eight year old. During the period from 8 to 20 years, litterfall production increased as the stand grew. The averaged annual amount of litterfall was estimated to be （1109.86±117.27）kg?hm-2, of which leaves, branches, fruits and chippings accounted for 63.75%, 25.87%, 5.11% and 2.19%, respectively. Seasonal change in litterfall was also observed in the successive replanting C. lanceolata plantation. Litterfall amount increased from January to June and then decreased from June to December. The highest value of litterfall occurred in June and the lowest was found in November. Litterfall production (y) was significantly correlated with stand age (x), which can be quantitatively expressed by the regression equation: y=-10.06x2+361.1x-1747, R2=0.920, p<0.001. There was also a conic relationship (p<0.05) between the production of branches, leaves and fruits litterfall and forest age, while the relationships of chippings and forest age were not significant.