Abstract: In this study, time and space variation of structure of soil arthropod community in artificial and secondary forests in the ecotone of forest-steppe at northern part of Hebei province, were investigated thoroughly. The results showed that Arcarina and Collembola were the dominant groups. The groups of soil arthropod varied with seasons, being the maximum in summer, fewer in autumn, and the minimum in spring. But the individuals of soil arthropod were the maximum in autumn and the minimum in summer. The group and individual numbers of macro and meso fauna had different rules in different plots. The research showed that the numbers of groups and individuals in secondary forest were greater, and the diversity was higher than artificial forest. The group and individual numbers of soil arthropod were reduced in the three different areas, and they showed obviously natural of surface gathering, but in some plots there were the contrary rule.