A system for automated analysis and optimization of building automation systems, comprising at least one building automation system with at least one building control and several building systems connected to the building control by means of a data connection for control by the building control, wherein a data module is suitably connected to the respective already previously existing building automation system in order to automatically read in all building-related data communicated in the building automation system between building control and building systems as raw operating data of the building systems and transmit them to an analysis server, wherein the analysis server is provided to assign individual raw operating data to individual physical parameters and individual building systems by means of a big data approach without further knowledge of the building control and the building systems from a total amount of the raw operating data transmitted by the data module by using an analysis program executed on the analysis server, wherein in the big data approach, certain information is filtered out of the available data, which information allows statements to be made about the characteristics of the general system operation, and the analysis program categorizes, classifies and stores the raw operating data according to their data structure in corresponding time series in accordance with the respective categories and classifications, wherein the analysis program first determines a type class of the time series from a plurality of time series of known building automation systems, and wherein the analysis program uses time information present in the raw operating data or a time stamp with which the data module provides the read-in raw operating data for the compilation of the time series, wherein the data module transmits the time stamp together with the raw operating data as a data packet to the analysis server, and wherein the system is configured to optimize building-related control circuits based on the raw operating data analyzed by the analysis program, wherein the analysis server is provided to transmit control commands to the building control based in the analyzed raw operating data in order to optimize the control of building systems, and wherein type classes of time series are determined from known time series of building automation system, wherein there are target values among the determined type classes, and wherein the analysis program compares the actual raw operating data to target raw operating data, and the control commands are transmitted to adapt the actual raw operating data to the target raw operating data. wherein the analysis server is provided to transmit control commands to the building control based in the analyzed raw operating data in order to optimize the control of building systems, and wherein type classes of time series are determined from known time series of building automation system, wherein there are target values among the determined type classes, and wherein the analysis program compares the actual raw operating data to target raw operating data, and the control commands are transmitted to adapt the actual raw operating data to the target raw operating data.