探讨了用水平法与简单t检验在缺区、缺株、方差不齐性条件下评选出优良家系数目上的差别，及简单t检验的精度问题.提出了用水平法与简单t检验相结合进行家系评选.从32个家系中选出优良家系11个，材积现实增益35.8%.%The paper approached the difference of the number of selectedsuperior family between the methods of performance level analysis and simple t-test, under the condition of missing plots, missing trees and variance heterogeneity. The accuracy of simple t-test was analyzed. It was put forward that family selection can be carried out by combining performance level analysis and simple t-test. Eleven superior families were selected from the 32 tested families and the real gain for volume was estimated to be 35.8%.
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