Abstract: In order to realize automatic top coal caving of the top coal caving mining face, and to solve the difficulty of automatic identify the coal rejects, a portable terminal of coal rejects identification was designed based on ZICM2410 communication module.The paper introduced the coal rejects identification system of the high C utting top coal caving hydraulic powered support and the working principle, system composition, circuit design and software design of the portable terminal.The vibratio n sensor and several coal rejects identification mathematics model were applied to effectively identify the coal rejects status.With the wireless communication technolog y transmission and the coal rejects caving real time conditions displayed on the portable terminal, the operators could control the coal caving windows and could effecti vely reduce the interfusion value of the coal rejects. The coal rejects portable terminal was applied to the top coal caving trial in Baidong Mine.The results showed that t he application of the portable terminal could make the graphic application and easy operation of the coal rejects identification technology.