Abstract: The paper aims to explore the feasibility of the combined roof container greening on old buildings which were not designed to provide the load for gardening. Sedum lineare Thunb, Sedum sarmentosum Bunge, Viola philippica, Zephyranthes candida were planted in different planting containers formed from plastic pots and wooden pots of different sizes and shapes to compose the combined container roof greening, and the authors determined the increased roof load, temperature, noise reduction, water storage and drainage values, then evaluated the greening effect. The results showed that: the increased load of the combined roof container greening was lower than the temporary load, and its cooling and noise reduction effects were obvious, the ability to accumulate rainwater and delay runoff peaks was strong, and the greening effect were significant. On the roof of old buildings which were not designed to provide the load for gardening, the combined roof container greening could be used because its safety is guaranteed, meanwhile, building roof greening has good environmental benefits, such as cooling, reducing noise, relieving the urban drainage pressure and so on, and is worth being promoted in large areas.