Abstract: In order to cope with large-scale flexible loads with heterogeneous characteristics connected to smart buildings, and to solve the problem of load fluctuations in buildings caused by the randomness of renewable energy and the uncertainty of flexible and heterogeneous loads, it is necessary to reasonably manage and control flexible and heterogeneous loads. A collaborative control method for heterogeneous loads in intelligent buildings considering multiple time scales is proposed. Firstly, considering the differences in power consumption characteristics and response characteristics of heterogeneous loads, the heterogeneous loads in the building are clustered into transferable loads and curtailable loads. Furthermore, considering the time-domain complementarity of the volatility of renewable energy and heterogeneous loads, a two-stage joint optimization dispatching model of day-ahead-intraday is established. The example simulation shows that the coordinated interaction between heterogeneous loads and multi-time scale rolling optimization can effectively reduce system load fluctuations and significantly improve the overall operating economy.