Abstract: The seed orchard covers an area of 0.7 hectare with about 200 trees (42 clones), which were grafted with mature scions in 1966 and now are 8-9 meters high on an average. It is located in Yangkou Forest Farm, Fujian province.According to the numbers of "male cones", the trees in the orchard were divided into three classes, i. e. "single", "disorder" and "cluster". Three or four trees were selected from each class at random, and the numbers of "male cones" on each tree and the numbers of pollen grains per "male cone" were counted separately.The average numbers of pollen grains per microsporangium were 3, 700, and there were 264 microsporangia in each microstrobilus and 26 microstrobiluses in each "male cone". Thus, it was estimated that a "male cone" produced about 2, 540 x 104 pollen grains.According to the numbers of "male cones" per tree in the clonal seed orchard of Chinese fir and the numbers of pollen grains per "male cone" , the numbers of pollen grains produced by each tree could be estimated. The average numbers of pollen grains per tree in each class were 532 x 108. So by estimate there were about 91, 540 x 108 pollen grains in number in this orchard.?122