Abstract: On demand of the enterprise information analysis and decision system for data quality，the method and procedure of data integration in process industry are discussed，especially for two categories of data：process real time data and analysis data from laboratory. As there exits time-delay，asynchronous frequency and high noise，we emphasized on the method involving steady-state detection algorithm，soft-sensor implementation process，transformation between cumulated and instantaneous value，data compression and store，etc. An example of industrial application has proved its validity and the future foreground of the proposed method is expected.