In order to investigate the effects on the seed quality of Larix principis-rupprechtii in different collecting seed time,the seed weight,morphology,seed yield and sowing quality of Larix principis-ruppre-chtii were preliminary determined by the test methods. Meanwhile,the scientific basis was provided on the seed collecting time of Larix principis-rupprechtii.The results showed that:along with the change of collect-ing time in a certain time frame,the changing extension of cones weight increased slowly then began to de-cline,and the yield and quality of seeds increased slowly and then decreased. The suitable seed collecting time should be after late August to early September.
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