The present invention discloses a building control system and a data analysis method and device used for the building control system. The building controls system comprises N power consumption devices, and the method comprises the following steps of obtaining the user resident information in the radiation space of each of the N power consumption devices, wherein the user resident information comprises the resident starting time and the resident ending time; according to the time sequence, analyzing the user resident information in the radiation space of each power consumption device to obtain the behavior habit information of the users; according to the behavior habit information of the users, carrying out the function marking on the corresponding area of the radiation space of each power consumption device to obtain the function marking information of each area; according to the function marking information of each area, generating the starting time and the closing time of the power consumption device corresponding to each area. The method obtains the usage rules of the power consumption devices according to the behavior habits of the users, and adjusts the power consumption devices according to the rules, thereby reducing the unnecessary energy waste.