Based on the numerical simulation, the influence of total pressure probes of four different structures (type A, type B, type C, type D) on the flow field and their own total pressure measured values under different near-wall distances was studied, then verifies the numerical simulation results with the experimental results. The results show that: the smaller relative near-wall distance c/d is, the larger error of the airflow deflection angle of the front end of the total pressure probe is, the larger measurement error of the total pressure probe is, and the maximum value of total pressure loss coefficient is less than 1%. When c/d>3, the total pressure loss coefficient is close to 0, indicating that the wall effect fails when the near-wall distance is greater than 3 times the outer diameter of the probe. Influence of wall effect to measured values of the total pressure probes of the four structures are sequentially increased in the same condition. the uniformity of the measured flow field is reduced, and the velocity uniformity is the smallest behind the total pressure probe support rod.