Abstract: The Chinese Firorchard of Changle, Zhejiang Province was built in 1976, now there are elementary seed orchard in the areas of 514 mu and first-generation one of 136 mu. In this paper, the way guiding orchard construction, the main managing technology and the improving effect of the seed orchard are studied systematically. Through analysing materials, we find that in Zhejiang region where there is less of Chinese Fir resource, we may collect plus tree materials from original area to build Chinese Fir seed orchard, the latter generations of the parent tree in orchard gain obviously. The average volume of 7.5 years old progeny plantation increased over 30% compared with local check. The study also revealed that the climatic factor, especially the precepitaticn and the sunshine time in February and March, the source of parents, soil fertility, slope orientation etc are the important factors affecting the output and quality of seed in the orchard.