【Background】The Chinese citrus fly ［Bactrocera minax ( Enderlein)］ is one of major citrus pests in China. The forecast and understanding of emergence progress and seasonal dynamics of adult flies is the important guidance for controlling of this insect pest. 【Method】The emergence of the adults was observed at the constant temperature 25 ℃, indoor room temperature, and an outdoor screening house, using the fly pupal rearing method. The dynamics of adults in nature was followed in the citrus orchards by setting up 240 McPhail traps with sugar-alcohol-vinegar solution and proteinaceous lures at five locations of Chongqing and Sichuan.【Result】At the constant temperature 25 ℃, adults started to emerge on 25 April, and peaked on 28 April. The last adult emerged on 30 April, and successive time of the peak period was 6 days; at the condition of indoor room temperature, they were 3th, 7th and 10th of May, respectively, and the successive time was 8 days; in the outdoor screening house, adults started to emerge on 8 May, peaked on 13 May and ended on 18 May, and successive time was 11days; trapping in citrus orchards yielded hte first adults on 2 June, with a peak of 13, and end of 26 June, and the successive time was 25 days. 【Conclusion and signification】The peak period of the adult eclosion unearthed was shifted to an earlier date, and the successive time was decreased under increased temperatures. Although pupae rearing in the screening house and adult trapping all were under natrural, outdoor conditions, the beginning, peak, and end dates for trapped adults were later than in the screening house by 36 days, 30 days and 22 days, respectively. Therefore, guidance on the control for adult fly should not solely be based on citrus orchard trapping data due to its obvious timelag. Pupal rearing in screening houses could better forecast the emergence of adult Chinese citrus fly.