This paper analyzed the spatial structure of two Quercus aliena var.acuteserrata secondary forests between shady slope and sunny slope by the parameters(uniform angel index,mingling degree,neighborhood comparison) on south slope of Qinling Mountains.The result showed that:(1)there was abundant species diversity of Q.aliena var.acuteserrata community.Q.aliena var.acuteserrata had the biggest importance value,also in a principal ecological space.(2)The main spatial structure of Q.aliena var.acuteserrata was random distribution because of the number of uniform angel index higher than 0.5 of individual tree over 50% between the two different slopes.(3)The proportion of five different tree differentiation classes are all about 20%.There was no difference among the differentiation classes of Q.aliena var.acuteserrata community.The number of dominant tree on the sunny slope was higher than that on the shady slope.(4)The mingling of trees mostly presented moderate or high,based on the proportion was 84% and 73% of mingling over 0.5 on the sunny slope and the shady slope.Above all,Q.aliena var.acuteserrata secondary forest had low aggregation degree,good mingling degree,higher differentiation,significantly population abundance,and in a relatively stable state.