Because of its high output，much more dust is produced in fully-mechanized Longwall mining with top-coal caving (LMTC) mining faces than in conventional mechanized mining faces without top-coal caving. Now dust control in fully-mechanized LMTC mining faces has become a key technological problem needed to be solved. Baced on the ejected dust removal technology, this paper developed a coal dust extraction which used in the fully mechanized LMTC mining face. For the optimization of the extraction’s property, measure systems are designed. By amounts of assembled experiment, the best structure of the extraction is found. In this paper, the research of the spray characteristic on the water nozzle was carried out by using the jet parameter testing system. Some important result can be gotten such as the velocity of spray particle, the distribution of the velocity, the diameter of spray particle, the spread of the spray particle etc. The study was helpful to optimizing the exhausting-flowing remover and improving the dust remover’s efficiency. From the industry examination, the coal dust extraction’s performance has greatly improved.