Aiming at the issue of excessively high pressure pulsation amplitude in a certain centrifugal pump，a steady‑state numerical simulation method was employed to analyze the internal flow field of the pump，and a design for locally thickening the middle section of the impeller blades was proposed.This design is intended to adjust the internal flow field of the pump，enhance the uniformity of the circumferential energy distribution at the impeller outlet，and thereby reduce pressure pulsation.Steady‑state and unsteady‑state numerical simulations were conducted on the centrifugal pump before and after the improvement.The pump before improvement was also subjected to hydraulic performance tests，the head is 23.4 m at design flow rate which is 120 m³/h.The pump characteristic curves obtained from the tests were consistent with those from the steady‑state numerical simulations.Comparing the numerical simulation results of the centrifugal pump before and after the improvement.The difference between the simulated heads of the two impellers is only 0.3 m，and the difference of the best efficiency is less than 1%，and the best efficiency point of the improved impeller is shifted from 130 m³/h to 120 m³/h compared to the prototype impeller.It is found that the improved impeller with the design of locally thickening the middle section of the blades has hydraulic performance close to that of the prototype impeller.Moreover，the improved impeller exhibites a more uniform circumferential energy distribution at the outlet compared to the prototype impeller.The blade frequency pressure pulsation amplitude at the monitoring points within the pump is reduced by 16.4% to 49.4% relative to the prototype impeller，and the overall level of pressure pulsation intensity within the pump also decreases.The comparison results indicate that the design of locally thickening the impeller blades can help reducing the pressure pulsation within the pump，thereby suppressing pump vibration.The blade local thickening design involved in this study can serve as a reference for the improvement of other centrifugal pumps that require reduced pressure pulsation.