Abstract: Meso- and micro-soil fauna can be used as an important indicator of habitat quality. It's not only sensitive to changing environment, but also plays an important role in soil ecosystem. So it is used to evaluate ecological effects of measures of reforming low-efficient cypress forests in this study. A field experiment, carried out in a cypress forest, was designed to have 6 treatments, that is, Treatment HT (interplanted with walnut trees free of mulch), Treatment HB (interplanted with walnut trees and mulched with white film), Treatment HH (interplanted with walnut trees and mulched with black film), Treatment HZ (interplanted with walnut trees and mulched with shade net), Treatment HD (interplanted with walnut trees and mulched with litter) and Treatment BM (no interplanting and no mulching). Investigations of meso- and micro-soil faunal diversity were performed during the period from June, 2013 to June, 2014 for comparison. Meso- and micro-soil animals were isolated from the soil, using the dry and wet funnel methods, and a total of 4 893 soil faunal individuals were gathered and sorted into 13 groups, 5 classes and 2 phyla. Results show that composition of that soil fauna, in terms of dominant group, common group, and scarce/rare group, varied sharply with the treatment. Similarity analysis reveals that structure of the soil fauna community also differed greatly between treatments. In Treatments HT, HB, HH and HZ population, individual density, Shannon index, Pielou index and Simpson index of the meso and micro-soil fauna increased significantly(P<0.05), with Treatment HD in particular. Besides, the four treatments affected spatial distribution of the soil fauna remarkably, and improved soil physic-chemical properties. And the improved soil properties and their interactions jointly affected structure of the soil faunal community. Treatment HT did have some marked effects on soil total potassium, readily available potassium, organic matter and spatial distribution of the soil fauna (P<0.05), but not much on population, individual density, Shannon index, Pielou index and Simpson index of the soil fauna. In conclusion, the treatments of interplanting walnut trees and mulching is proven to be able to improve community structure of the meso and micro-soil fauna in the low-efficient cypress forest and the treatment of interplanting walnut trees and mulching with litter (HD) is the most outstanding in this effect.