The vector sensor is composed of omni directional sound pressure sensors and dipole directional particle velocity sensor, and widely used in underwater acoustic fields; but in actual applications, the vector sensor is usually fixed at an installation platform, whose scattering field will inevitably distort the vector sensor’s receiving field, thus affecting its measuring results. Taking the practical application as the background, a sound scattering module of the influence on the vector sensor’s direction measuring under the condition of elastic spherical shell is theoretically built in the essay, and the influences on the accuracy of direction measuring with different incident frequencies, different observing locations, different thickness and radius of the shell are analyzed by simulation. The results provide the theoretical support for the application of vector sensor in underwater acoustic measuring.