[Objective] Excellent family of Taxodium distichum were preliminary selected. [Method]Progeny test forest was conducted on diameter at breast height(DBH) ,tree height,stem volume of 15 families of 6 years old Taxodium distichum in Santai Forest Farm in Jianghan Plain. [ Result ]There were significant differences among families on DHB, tree height and stem volume. The family herilability of DHB, tree height and volume were above 59% and DHB was up to 79.82% ,the growth characters were mainly controlled by genetic factors. 6 excellent families were selected according to grading of breeding value, their average genetic gains were 6.9% ,4.6% and 11.3% , and the real gains were 8.1% ,6.9% and 16.3% ,the third family had highest genetic and real gains on DHB, tree height and volume. [Conclusion]The selected families had obvious growth advantage and should be preserved as excellent genetic materials,they also could lay a foundation for long tern selection of excellent family of Taxodium distichum.%[目的]初选一批落羽杉优良家系.[方法]对江汉平原三台林场6年生落羽杉15个家系子代测定林的胸径、树高和材积进行调查和分析.[结果]不同家系间的胸径、树高和材积差异极显著,胸径、树高和材积性状家系遗传力均在59％以上,各性状受到中等至较强度的遗传控制,其中胸径家系遗传力高达79.82％；利用育种值评分法从15个参试家系中初步选出了6个优良家系,平均遗传增益分别为6.9％、4.6％和11.3％,平均现实增益分别为8.7％、6.9％和16.3％,其中③号家系胸径、树高和材积均有最高的遗传增益和现实增益.[结论]所选出的优良家系生长优势明显,可作为优良遗传材料进行保存,同时也可为落羽杉优良家系的长期选择奠定基础.
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