In order to study the blasting dust transportation law of the tunnel, we establish the tunnel blasting pressure-entry ventilation model based on the background of the extended mining technology transformation project of urnfu phosphorus mine, and analyze the characteristics of the pressure-entry ventilation wind flow and dust transportation law by using the numerical simulation research method. The results show that: the wind flow from the outlet to the working face of the process, the wind flow velocity decreases, the wind flow to the working face will occur when the phenomenon of reflux. After blasting, the dust moves with the wind flow to the exit direction of the roadway, and the dust concentration on the return side is larger than that on the wind pipe side, and the dust in the roadway is basically discharged in 400s after blasting. With the increase of the distance of the ventilation pipe from the working face, the dust concentration in the working face increases; with the increase of the ventilation air volume, the dust concentration at the working face gradually decreases; the smaller the amount of dust produced in the working face, the shorter the time required for the dust concentration to fall to 2 mg·m-3. The best ventilation parameters for the urnfu phosphate mine should be ventilation pipe distance from the working face of 8 m, ventilation pipe air volume of 848 m3/min, this parameter is conducive to the roadway blasting dust control.