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According to the problem that the high concentrations of fully mechanized caving face is difficult to control, the mathematical model of solving two-phase flow of gas and dust particles was built by established the k-ɛ-Θ-kp equation. Moreover, by basing on Eulerian-Lagrangian model and Eulerian- Eulerian, and using FLUENT software, the diffusion law of dust pollution in full-mechanized caving face was confirmed. The article focuses on existing conditions that the nozzle arrangement of hydraulic support in fully mechanized caving face is flawed so that it can cot to reduce high concentration dust in working face effectively, so we through the theoretical analysis and field test method and the arrangement of equipment at working faces, when spray of forestope is perpendicular to the coal wall, the angle of spraying of truss frames is found to be 45° and the pressure of spraying is 8MPa.Therefore,we take these arguments as the most optimal nozzle arrangement of hydraulic support in fully mechanized caving face. After the research result is applied to the 1303 fully mechanized face of Dongtan Coal Mine, respirable dust fall rate can be high up to 95.8%, dust concentration in working face is reduced effectively, the working condition is mostly improved and the mining is prevented from the danger and low-efficiencies

Optimization Research of Hydraulic Support in Fully Mechanized Caving Face