A manual fixed fire water monitor of type 100 was designed. The monitor can rotate 360º in horizontal direction. It can rotate from the angle of -40º to the angle of 70º in vertical direction. The monitor spraying position can be adjusted by operating the handwheel and it can also automatically be locked. The flow simulation was completed using Fluent kits. The influence of the flow channel which affects the velocity and pressure field was analyzed. The energy loss was explained. The influence of the flow structure which affects the internal flow's turbulence and outlet velocity was obtained. The experiments were carried out on the test rig. The experimental results accorded with the simulation results in general. The relevant results can verify the reasonableness of the designed fire water monitor. It can provide some theory reference to the further optimization of the monitor design.