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Outboard static pressure measurement method was proposed for aircraft airspeed calibration. In order to reduce the impact of flow around caused by profile of the measurement device and to improve static pressure measurement accuracy, we analyze the impact of flow with commercial software package, FLUENT. From our analysis, the types of transitional structures with the minimum flow range are obtained. Then the structural geometric include contraction angle β, transition length L, maximum diameter ΦD, minimum diameter Φd are optimized based on the orthogonal test design method. It shows that the optimum structure shape is arc transition; the maximum diameter and transition length of the profile produce significant impact on air flow; the optimal combination of parameters is β=33°, L=40mm, ΦD=50mm, Φd=22mm. And by optimization, the structure has reduced the impact of flow around by 37.5% for the static pressure tube and greatly improved static pressure measurement accuracy.