Abstract: The assessment and measurement of total pressure distortion of the inlet is significant in the assessment of the integration of the inlet and engine. S-shaped inlet possesses great stealth performance, but the complex fluid field in the outlet contributes to error in the measurement and assessment, which impedes the integration of the inlet and engine. The experimental results show that the sector fitting is suitable for data processing of total pressure in the S-shaped inlet. The circumferential total pressure distortion index increases from 0.005 to 0.09 while the maximum radial index not exceeding 0.055 with the increase of Mach number from 0.2 to 0.6. The higher Mach number is, the severer total pressure distortion is. Total pressure recovery index of the main area of total pressure distortion in outlet is below 0.85. In total, compared with numerical computation and the rake measurement, the results of five-hole-probe measurement are more comprehensive and rational.