Abstract: Data search is one of the core functions of a monitoring system. The effective monitoring system should be based on a flexible and efficient query mechanism. But,at present,the query mechanism of coal mine monitoring system is only concerned on the value variety of single sensors. It cannot provide queries about various objects or the same object during different period,limiting the ability of the coal mine monitoring system. This paper proposed an event-driven query mechanism based on temporal operators. This new query mechanism will enhance the query ability and be a basic supporting technique for coal mine monitoring system.