In view of "information island" problem which is common in coal mines, a smart mine information interaction method based on resource model and constrained application protocol (CoAP) was proposed from practical point of view. Two key issues to be solved in realizing information interaction are analyzed: data modeling and presentation issue, that is, how information sources display the information and services they can provide; interaction protocol issue, that is, how to communicate between information consumers and producers. For the data modeling and representation issue, a resource model is defined, and the information provided by sensors,corresponding operation authorities and data types can be obtained through resource model definition file. For the interactive protocol issue, the characteristics of declarative protocol and imperative protocol are analyzed and compared, and CoAP is selected as the information interaction protocol which is more in line with the openness and expansibility requirements of coal mine Internet of things. Experimental results show that the method can increase flexibility through options and resources on the basis of maintaining the stability of the interfaces, and can easily and quickly implement information interaction operations such as creation, query, modification, deletion and notification; unified information interaction can be easily achieved by modifing existing equipments software, which lays a foundation for realization of smart mine.
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