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对大山雀（Parusmajor）和沼泽山雀（P.palustris）巢地选择中17个生态因子作了比较研究,通过逐步判别分析得知：两种山雀在9个环境因子中都以平均树高（y2）、中心上层植物盖度（y4）和树种多样性（y5）三个生态因子判别力最强．为主要环境因子；两种山崔在8个洞因子中都以洞口短径（x2）、洞口内径（x5）和洞底短径（x8）三个生态因子判别力最强，为主要洞因子.在巢地选择中洞因子比环境因子相对重要（x2＝26.22＞13．99）两种山雀巢地选择中的区别是：3个主要环境因子中，大山雀与沼泽山雀相比较差异极显著（fmd＝6.02＞f0.01）；3个洞因子中沼泽山雀与大山雀相比较差异极显著（fmd＝6.02＞f0.01）．
Seventeen ecological factors in nest selection of Parusmajor and P. palustris were compared. By stepwise discriminant analysis, we found that both species had average tree height (y2 ), The upper ecotype (y4) and species diversity (y5) have the strongest discrimination. As the main environmental factors. Among the eight cave factors, the two kinds of Shan-Cui had the strongest discriminating power among the three ecological factors, namely the short hole diameter (x2), the inner diameter of the hole (x5) and the short hole diameter (x8) . The choice of middle hole factor in nests is more important than environmental factors (x2 = 26.22> 13.99) The difference in nest selection among the two species of tits is that among the three major environmental factors, the difference between great tits and marsh tits is significant (Fmd = 6.02> f0.01). The difference between marsh tits and big tits in the three cave factors was very significant (fmd = 6.02> f0.01).