With the rapid development of the grid， information quantity increases. Traditional centralized data collection method makes data acquisition server load problem become more and more serious. To solve this problem， this paper proposes a distributed data acquisition method used in unified city and county dispatching automation system. All of the data acquisition task can be disassembled to several parts. Each data acquisition is only deal with own task， and other region's information are not consumed the resources in this region. Every data collection area work together to complete the entire data collection tasks of system. Each real-time data acquired by every data collection is shared across the system automatically without manual setting.