<正>根据目前我国拉索型桥梁索结构的防腐体系均遭到不同程度破坏的现状，在对索结构防腐体系破坏原因分析的基础上，结合南京长江第三大桥的特点，研究了拉索的防腐系统。结果表明：选择双峰HDPE护套，及在拉索内填充具有水汽隔绝、阻蚀防腐和润滑抗磨双重作用的防腐填充物，可延长拉索的使用寿命。该研究已成功应用于南京长江第三大桥的斜拉索体系。

Chinese fir (Cunninghamia lanceolata Lamb.) is one of the most important timber tree species planted in southern China. Inorder to push the development of planting Chinese fir by utilizing fine variety, research progresses on techniques of establishing Chinese fir seed orchard, improving output and quality of seed orchard and the like were commented systematicaly, and some measures for future research were put forward.