The installing position of sliding angle transducers will affect the measurement accuracy of the transducers, and their wake will also affect other transducers installed on the side of the cockpit. So studying the installing position of sliding angle transducers is important to the controlling and safety for commercial aircraft. The computational fluid dynamic (CFD) method based on unstructured mesh was applied to investigate the effects of sliding angle transducers installing position on the local sliding angle and local attack angle distribution. Three configurations, clean body and clean bodies with sliding angle transducers which were in two different install locations, were simulated. The inflow Mach number was 0.85 and the attack angle was ±2° while the sliding angle of inflow was 0°~ 20° for clean body configuration and 0°and 10° for transducer configuration. The flow field, local sliding angle, local attack angle and non-dimensional volticity distribution at cockpit offset surface were compared and analyzed. The local sliding angle distribution with the inflow sliding angle was obtained; the influence area of the sliding angle transducers was identified and proper installation location for the attack angle transducer was suggested.