Abstract: Objective To analyze seasonal variation and larval breeding characteristics in the density of Ae. albopictus in Longgang District, Shenzhen, 2017-2019, so as to provide a reference for the development of local dengue fever prevention and control measures. Methods From 2017 to 2019, surveillance points were set up in 11 sub-districts of Longgang District, the density of Ae. Albopictus larvae was evaluated by the Breteau index （BI）, and that of Ae. Albopictus adult was evaluated by the mosq-ovitrap index （MOI）. Analyze the mosquito density（BI, MOI） in different months and different environments and the correlation between BI and MOI. Results The average BI was 3.52 in 2017-2019. During the three years, the BI showed an increasing trend year by year. The BI of different years and of different months were statistically significant （P<0.01）. Of these, the BI peak in 2017 and 2018 were September （BI=6.09 and 5.81, respectively）, and in 2019 was May （BI=6.11）. The BI of different environments was statistically significant （P<0.01）, among which the BI of residential areas was the highest （BI=5.00）. The average MOI was 5.04 in 2017-2019. During the three years, the MOI showed a fluctuating trend. The MOI of different years were not statistically significant （P>0.05）, but the MOI of different months were statistically significant （P<0.01）. The MOI peak in 2017 was August （MOI=9.90）, in 2018 was September （MOI=8.82）, and in 2019 was June （MOI=9.83）. The MOI of different environments was statistically significant （P<0.01）, among which the MOI of park was the highest （MOI=5.49）. BI and MOI in the same period were positively correlated （P<0.01）. Conclusion The density of Ae. Albopictus in Longgang District was high and was obviously seasonality. Strengthen the monitoring and risk assessment of Ae. Albopictus will provide the reference for the scientific and reasonable mosquito control measures.

Key words: Dengue, Ae. Albopictus, Breteau index, Mosq-ovitrap index