Abstract: In the field and laboratory studies conducted during 1987-1988, Zygogramma suturalis, introduced from Canada and USSR in 1987, had three generations a year in Beijing region. Overwintered adults resumed activity and began feeding in late April or early May, Adults of the 1st, 2nd, and 3rd generations occurred in mid to late June, late July to early August, and early to mid September, respectively. Under a constant temperature of 26°±1℃, the average longevity of the female and male adults was 82.5 and 67.8 days. The mated females began ovlposition 16.5 days after their emergence from the soil. Oviposition lasted an average of 49.1 days with 394.5 eggs laid by each individual. The developmental period of egg, larval and pupal stages was 5.0, 13.9 and 12.9 days, respectively, under 26°±1℃. The larval and pupal survival rate in the rearings at the constant and natural room temperatures was all above 66%.