[Objectives]  The habits, community structure and population dynamics of predacious arthropod communities in peach orchards was investigated to improve pest control methods. [Methods]  Five to six year old peach orchards were selected inNorthwestA&FUniversity’s experimental farm as study sites. The species and numbers of predacious arthropod communities in selected orchards were systematically investigated by measuring the relative species abundances, dominant, species diversity, evenness and dominance. [Results]  The diversity and evenness index showed a high-low-high-low tread, and the dominance index and index of dominant concentration were a low-high-low tread. The syrphid fly, spider, ladybeetle, carabid beetle and lacewing were the predominant predacious arthropod sub-communities in peach orchards. Metasyrphus corollae and Episyrphus balteata were the dominant species of the syrphid fly sub-community, which reached peak abundance in middle May to late June. Propylaea japonica was the main species of the coccinellid sub-community, with a population peak beginning in middle May to late July. P. japonica ab. tessellata and ab. ancora were the most common color variants of this species in peach orchards, accounting for 49.6% and 29% of the population, respectively. Linyphiidae, Thomisidae and Theridiidae were the dominant groups of the spider sub-community, which peaked in early and middle May, middle and late August as well as mid-October. The peak of the carabid sub-community occurred from early May to late June. Chrysoperla sinica was the predominant species of the lacewing sub-community, which reached peak abundance in early June to early August. [Conclusion]  The predacious arthropod community in peach orchards was mainly comprised of spider, syrphid fly, predacious ladybeetle, carabid beetle and lacewing sub-communities. The structural characteristics of different predacious arthropod sub-communities varied with season and temperature, which played a major role in the control of insect pests.