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In order to solve the problems of high cost, low efficiency and poor real-time performance in the traditional oil smoke detection method, an on-line real-time monitoring system for oil fume is designed and developed. The system consists of four modules including acquisition, communication, server and user interaction.The acquisition module collects soot data and sends the data to the server via GPRS communication technology. The data is decoded in the server according to the decoding rules and stored in the database. The communication module is developed using the MINA framework, and the server module is developed using the Spring,SpringMVC and Mybatis(SSM) framework. The user interaction module is in the B/S mode, and the user logs in to the monitoring website to access the server. Server provides real-time data, historical data and over-standard data to query for users, which can greatly facilitate the supervision and management of fume emission by relevant departments, and improve the work efficiency and service quality of the monitoring center.