| Soil animals are special community in ecosystem which play an important role in the substance circulation and energy transform. In the recent time, many scholars has studied soil animals, but many of them focus their studies on natural and semi-natural ecosystem such as forest, Greenland, farmland and so on. Information on the composition, distribution and environmental characteristics of soil animals had been investigated from tropic to temperate zone, from plain to mountain, but it was studied rarely on city ecosystem.Four categories of primary greenlands(ineluding Nursery Greenland, Road Greenland, Shelter-forest Greenland and Park Greenland )were chosen in Baoding city. The composition and number, horizontal and vertical distribution, dominant groups and diversity of soil animals community were investigated, while the relationship between biotope and soil animals communities was analysed. The results are as follows:(1) There are 1462 specimens belonging to 14 groups, 2 phyla in the four categories of Greenlands. The dominant groups were Aconite, Collembola and Hymenoptera, while Tubificidae, Arenas, Isopoda, Diplura, Coleoptera larvae were the ordinary groups and others were rear groups, The dominant groups and the ordinary groups account for 72.85% and 24.83% of the total respectively.(2) The horizontal distribution of soil animals is uneven. The distribution regulation of the individual numbers of soil animal is similar in four categories of Greenlands except June. Among the individual numbers of soil animal, the order is: Nursery Greenland (526)＞Park Greenland(431)＞Road Greenland(326)＞Shelter-forest greenland(179). The vertical distribution is that three categories of greenlands have the characteristics of surface assembling except Shelter-forest greenland, while the difference is remarkable among them. The characteristics of surface assembling is most in Nursery Greenland.(3) The order of diversity index of soil animals in different greenlands is: Road Greenland＞Shelter-forest greenland＞Park Greenland＞Nursery Greenland; The evenness index is: Road Greenland>Shelter-forest greenland＞Nursery Greenland＞Park Greenland, and the difference isn' t significantly remarkable between greenlands; The dominance index is the highest in Park Greenland, the Nursery Greenland is secondly, and the difference isn' t remarkable.(4) The dominant groups are Aconite, Collembola and Hymenoptera in this area, while the dominance of Aconite is the highest.(5)The soil animals groups distribution is very evenness in Nursery Greenland, Abroad distribution pattern group, middle distribution pattern group and narrow distribution pattern group account for 33.33% of total respectively. The number of abroad distribution pattern groups are 5(35.71%), 3(33.33%) and 5(35.71%) in Road Greenland, Shelter-forest Greenland and Park Greenland respectively; The number of middle distribution pattern groups are 6(42.86%), 6(42.86%) and 3(33.33%) in Road Greenland, Shelter-forest Greenland and Park Greenland respectively; The number of narrow distribution pattern groups are 3(33.33%), 5(35.71%) and 6(42.86%) in Road Greenland, Shelter-forest Greenland and Park Greenland respectively; but the distribution pattern groups have difference between four greenlands.(6) The soil physical and chemical property have different impact on soil animals. The optimum humidity of soil animals is from 15% to 25%. The relativity between soil animal individuals and water content of soil is positive in some scale, The relativity index is the most closest in road Greenland, the second is Shelter-forest greenland, Park Greenland is the third and the fouth is Nursery Greenland. The pH value of soil has impact significantly on soil animals distribution, soil animals tend to enjoy neutral and alkaline soil; the relativity between number of soil animals and nitrogen is absolutely positive in 0～10cm and 10～15cm soil layer.
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