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Bees provide a variety of ecological services for urban ecosystems, while green roofs can also be of high value to bees through providing habitats and foraging sites. In this study, four hypotheses about impacts on abundance and diversity of pollinators were proposed from the roof and the surrounding environment. The evidences revealed that the height of the building affected the diversity of some bee species; increasing proportions of surrounding green space helped to increase abundance of bees and wasps; the colonies of bees were significantly affected by habitat connectivity, a frequent movement of bees and other mobile insects between roofs and ground guaranteed pollination of plants; plentiful plants combination was better than a single species in roof ecosystem services, and native forbs were beneficial for pollinations and foraging of pollinators; using fine substrate on green roofs may have a greater ecological value than common soil.

Abundance and diversity of pollinators on green roofs are affected by environmental factors