| Jujube-grain ecosystem, grain field ecosystem, weeding Jujube ecosystem and no weeding Jujube system were selected in Hebei Province and which the typical kind were investigated for nine times between May to September in 2007 each Half a month. This study investigated the composition, diversity and timing changes of the arthropod community for four ecosystem. The arthropod community flow changes of the species in Jujube-grain ecosystem were also studied. Concrete results are as follows:1. There are a total of 34,782 individuals belonging to 15 orders, 102 families were found in this study. And the dominant groups among them were Myriapoda,Lycosidae,Miridae,Delphacidae,Cicadellidae,Aphidoidea,Margarodidae,Geometridae,Noctuidae,Olethreutidae,Braconidae,Chrysopidae,Coccinellidae. The total number included 14,936 individuals belonging to 14 orders, 96 families in Jujube-grain ecosystem, 5681 individuals of the total in no weeding Jujube system belonging to 15 orders, 92 families, the 4162 individuals that could be divided to 10 orders, 78 families in weeding Jujube system, 10003 individuals in grain field ecosystem belonging to 12 orders, 86 families.2. The results showed that the arthropod community of Jujube sub-ecosystems and Grain field sub-ecosystems were clustered for 5 and 6 categories. In Jujube sub-ecosystem, the 1, 2, 3, 4, 9 branches were for a group, and 5, 6, 7 branches was for three independence groups. And the 2, 3, 4, 5 branches in Grain field sub-ecosystems were clustered in a group, the remained branches were for five independence group. So the results of two ecosystems were very similar. The result of optimization cut apart to time change show that the tow sub-system can be divided into four paragraphs as the same, the paragraphs of jujube yard sub-systems were 1-4, 5-6, and 7th , 8-9 times investigate, and for farmland sub-systems were the 1st, the 2-3, 4-6, 7-9 times investigate. It is show that the results are very similar too. The result of optimization cut apart to time change and clustering analysis was used to analyze the change of species current of the two sub-species and found that there is a very close interaction of arthropod community in two sub-systems.3. The natural enemies group, neutral arthropod group and phytophagy arthropod group of the two sub-systems were respectively analyzed and have found that all types of arthropods of the two sub-systems can be divided into three different types of groups. The first group is which living in two habitats and the species current is few impacted by the changes of habitats; The second group is which can living in two habitats in turn ,but can transfer to another in the time the habitats was deeply disturbed ;The third one can only living in one habitats and can make the another habitats as a temporary habitats. The latter two groups there are "source" system where the species current flow out of it and the "sink" system where the species flow into it.4.Through the comparative analysis of the arthropod community between intercropping system and the three control systems～the weeding jujube yard system, not weeding jujube yard system and the system of farmland, it is showed that the intercropping system have a more richer neutral arthropod groups. Compared to Weeding jujube yard system and system of farmland the intercropping system have more advantages in natural enemies groups and more disadvantaged phytophagy groups. And the intercropping system can rebuild the arthropod community more faster than the other systems after the system was seriously disturbed, so it is than compared to other three systems the intercropping system have more proper structure and more stronger regulation ability and also more stronger ability to control pest.
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