Distribution and daily activities of Bemisia tabaci adults in solar greenhouse (east-west oriented) were investigated with yellow sticky traps (YSTs, 25×30 cm in size) and by plant inspection in Gu’an County, Hebei Province from late April to early May when cucumber was vigorous fruiting. Results show that the YSTs installed in the north side of the greenhouse caught 1.87-fold more whitefly adults than those in the south side (668.8 adults/(trap•d) vs 357.5 adults/(trap•d)). Catches within each of the five two-hour intervals from 6∶00 to 18∶00 by YSTs in the north side were significantly greater than in the south side with an exception of the two-hour interval from 8∶00 to 10∶00. Number of B. tabaci adults on plants in the north side was also significantly greater than that in the south side. In the east-west direction, catches (daily average and averages within each two-hour interval) in the east side were not significantly different from those in the west side. B. tabaci adults were more active at certain periods of time than at others during the day as indicated by the percentages of adults caught on the YSTs at different time intervals; the highest percentage of adults was caught between 8∶00 to 10∶00 (25.7%) and the lowest, between 12∶00 to 14∶00 (13.2%). When the YSTs were arranged at east-west direction, the surface facing south caught significantly more B. tabaci adults than the surface facing north. The current results are discussed with reference to monitoring, adult trapping and IPM of B. tabaci on solar greenhouse cucumber