With the accumulation of time, data collected by environmental monitoring data processing system is more in the project of "Comprehensive Demonstration of Water Environment Management about Liao He River". However, Liaoning province environmental monitoring data processing system cannot effectively deal with massive data growing. In this paper, we study and use big data technology. After that, we improve the data center of the environmental monitoring data processing system. We can use HDFS powerful function of data storage and management to cope with the growth of the massive data and take advantage of MapReduce and other Hadoop related tools, rapidly processing massive data and reducing the data size. Finally, the data will be stored in the database.