Abstract: In view of problem of heterogeneous data integration in research and development of monitoring and early warning system of coal and gas outburst, the heterogeneous characteristics and typical heterogeneous data integration techniques of monitoring and forecasting data of coal and gas outburst were analyzed. A monitoring and early warning system of coal and gas outburst based on heterogeneous data integration was designed. The system uses Web services data integration model and service-oriented architecture, through WCF design to develop data integration Web services, and achieves reliable collection and deep integration of the monitoring and early warning information of coal and gas outburst. Field tests show that the system realizes automatic uploading of different kinds of early-warning information, and compared with the original comprehensive warning system for coal and gas outburst, its efficiency, reliability and accuracy of data collection and upload have greatly increased.