Abstract: Host selection behaviors of parasitic wasps are a comoplex and hierarchy process,which includes habitat preference, potential host location and host location. In the field,whether a parasitic wasp successfully finds its host or not is determined by many facors suchas climatic conditions, host density, chemical environment, physiological states and expriences.This paper surveys the recent progress in the study on host selection behaviors of parasiticwasps. The following aspects are included: 1. Host searching, oviposition and post-ovipositrion behaviors of the parasitoids and the cues employed, and 2. Behavioral variations of thewasps and associated factors including genotype, physiological states, experiences and learning. Prospective application of parasitic wasps in pest insect control is discussed.