The electro-hydraulic proportional directional valve with water medium is the core control component of intelligent hydraulic roof support, and the nonlinear flow force is the key factor affecting the performance of proportional valve. The taper slide valve with notches is the structure commonly used in proportional valves. The taper slide valve has two typical structural forms: throttling first then sealing and sealing first then throttling. The three-dimensional flow channel models of the two kinds of structures were established and meshed, in addition, the appropriate mesh density was selected through mesh independence verification. The flow forces on the valve spool under different opening and pressure difference were obtained by CFD simulation method. The results show that the variation trend of the flow force is same in two different schemes, and the flow force of sealing first then throttling structure is obviously less than 〖JP+1〗that of throttling first then sealing structure under the same working condition. Finally, a hydrodynamic verification test system was set up, and the correctness of CFD simulation analysis was indirectly verified by measuring the valve port flow and the pressure difference.