The distribution patterns of prime plant population in different established years of mixed artificial grassland were determined using 4 indexes: dispersion index, mean crowding intensity, patchiness index and the negative binomial parameter K, in order to discuss the change pattern and characteristic of aritificial grassland established in different years. Analyses showed that the distribution types of sowed species changed from both aggregate and random to all aggregate distribution; and the distribution types of unsowed species changed from random to all aggregate distribution with extended grassland years. The aggregate degrees were affected by both inner and inter species within 3 years. The aggregate degree of sowed species mainly showed a tendency of "first decreasing then increasing" while the aggregate degree of unsowed species increased in 3 years compared to 1 and 2 year grassland. Inter species reached the temporary stable state of distribution and aggregate degree to coexist during grassland established for 3 years.%为了探讨不同建植年限人工草地植被群落结构的特征和变化规律,采用扩散系数、负二项式K值、聚块指数、聚集强度等4项指标,对建植1～3年的混播人工草地植物种群分布格局分析表明,随建植年限的延长,主要植物种群中播人种的分布类型,由建植当年的聚集分布或随机分布,均变为3年时的全部集群分布状态,非播人种的分布类型由建植当年的全部随机分布状态,均变为3年时的全部集群分布状态；草地建植3年内,主要种通过种内、种间作用对聚集程度进行了调整.播人种的聚集程度绝大多数呈先减弱后增强趋势,3年草地非播人种的聚集程度较1年和2年的明显增强,形成了草地建植3年时种间共存的暂稳定状态.
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