Self-priming vacuum pump absorbs and transfers slurry by generating the internal vacuum pressure and the rotation of the impeller. Generating the internal vacuum pressure plays an important role in sucking the slurry at the inlet region of self-priming vacuum pump and it is mainly performed by the rotation of inducer. In this study, the hydraulic performance of self-priming vacuum pump was investigated with the changes of inducer inlet angle. Numerical analysis was also conducted under five different rotational speeds(2500, 2700, 2900, 3100 and 3300 RPM) by using commercial CFD code, ANSYS CFX. The results for mass flow rate, head and characteristic curve were prepared with various values of inducer angle.