The surviving and breeding abilities and the ecological factors cf house flies were determined by feeding in the laboratory from June 1983 to Sep. 1984. The periods of life cycle of the flies were shortened as atmospheric temperature rose, and the temperature suitable for the immature flies developing was 35℃.The optimum humidities of media were 75-80%, 65-70% and 45-50% to eggs, larvae and pupae respectively. The best food for larvae was"rodent chow" with wheat bran, and that for adults was powdered milk a...