Abstract: This paper deals with a number of biological problems of colonizing flight of coptotermes formosanus Shiraki.In a group of Coptotermes formosanus Shiraki,colonizing flight is carried out in differnet times.The winged image emerging time varies,there are even overlap phenomena.The colonizing flight occurs in the end of April or the beginning of May in Guangdong province.The peak stage is in the middle of May.The last stage is in the end of May or June,when colonizing flight occurs,the temperature ranges from 21.7 to 29.4 ℃,more often from 26 to 27 ℃.Relative humidity is between 82 to 99% usually 85 to 90%.The atmosphere is below one atmosphere;Rain is not indispensable during the days when flights are colonized.