Abstract: In order to effectively prevent the dust occupational hazards of the coal mine, based on the respirable dust density detection technology of the mine dust specially as the study object, the paper discussed the domestic and overseas separation technology and standard of the respirable dust particles and analyzed the total dust density continuous monitoring technology at the present environment and the personal respirable dust density monitoring technology. According to a blank status 0 f the environment respirable dust continuous monitoring technology at home and abroad, the paper provided a base idea to conduct the on-line continued monitoring of the environment respirable dust and to study the individual monitoring technology. The paper stated the development tendency of the dust occupational hazard monitori ng and early warning technology and to establish the framework mode of the dust occupational hazard monitoring and the early warning platform in coal mine. The stud y result showed that the separator to meet the“BMRC" separation curve would be the premise to realize the detection of the respirable dust particle density. The laser s cattering method, the micro quality oscillating balance method and others would be the major means. Only the early warning index system of the new occupational haza rd and the early warning model of the new occupational hazards established, the effective prediction of the coal mine dust occupational hazards could be really realized and the monitoring level could be improved.