The preparatory method of antisera on rabbit anti-mite was reported. It laid the foundation to study relationship between predatory mite and pest mite with ELISA test.

Density dependent, density independent and inversely density dependent predatism were mainiy caused by matual interference and aggregation among the predators.

Phytoseiid mites is the important predatory natural enemy of many injurious mites and small injurious insects, which has the important utilization value in agricultural production.