Abstract:To understand the factors affecting the population dynamics of the Oriental fruit fly, Bactrocera dorsalis (Hendel) (Diptera: Tephritidae) in Shanghai landscape green spaces, we inspected the population level with the entrapment method of adult fruit fly, and using the laborious survey research we investigated 7 influencing factors including host plant species, quantity, the distance between living places of population and food facilities, garbage stations, fruit markets, average air temperature and average relative humidity per day. The results indicated that the correlation coefficient between the population level and the host plant quantity was 0.938, they were positive correlation. The host plant quantity is the most important factor affecting the population level of the Oriental fruit fly. The correlation coefficient between the population level and the distance between living places of population fruit markets is -0.996, they were significantly negative correlation, these showed that the far the distance between fruit markets and the host plants, the less the population level. The cluster analysis demonstrated that the population level and the distance between living places of population and garbage stations was classified into one class, and they were grouped into one class with the distance between living places of population fruit markets. The population level was related to the distance between living places of population and garbage stations, fruit markets.