Intelligent data acquisition method and system in video surveillance system

The invention discloses an intelligent data acquisition method and system in a video surveillance system. The method and the system are applied to a video surveillance network system including a SIP server, a data management server and a plurality of frontend devices with intelligent video analysis functions. The method comprises the following steps: a frontend device registers on or logs out from a SIP server; the SIP server sets up or updates a device directory; a data management server acquires information of the device directory from the SIP server; according to the device directory information, the data management server requests, through the SIP server, the registered frontend device to open a data channel; the frontend device receives the request, responds to and accepts the request through the SIP server, and then opens the data channel between the frontend device and the data management server; and after the data channel is opened, the frontend device sends intelligent data to the data management server through the data channel. The method and the system solve the problem that a video surveillance system in the prior art does not have any unified method for intelligent data acquisition.