Abstract: 【Objective】The study was conducted to understand the population density and activity rule of Bactrocera dorsalis in pomelo orchards with different habitats in fruit ripening period, and to explore the trapping effects of different sticky cards in different directions and under different temperature environments on B. dorsalis.【Method】The monitoring and trapping experiments were carried out in two pomelo orchards with different habitats from September to November, 2019.【Result】One way ANOVA showed that the number of B. dorsalis trapped by every bright yellow sticky card in natural pomelo orchard was 24.84±1.90, and that in standard orchard was 4.29±0.44. The trapping effect was significantly higher than that of yellow and blue cards. The number of B. dorsalis trapped in natural pomelo orchard was significantly higher than that in standard orchard. The average number of B. dorsalis trapped in the south of the natural orchard was 12.01±2.02, and that of the standard garden was 2.52±0.44, both of which were higher than those in other directions. There was a negative correlation between temperature and population density of Bactrocera dorsalis in standard orchard. The number of B. dorsalis trapped in November was significantly higher than that in September and October.【Conclusion】The bright yellow sticky card had obvious control effect on fruit fly in pomelo orchard. The prevention work of standard orchard should be done in advance according to the population change rule of B. dorsalis under natural conditions in fruit ripening period, and comprehensive management should be carried out according to the local conditions in pomelo orchards.