In order to better suppress the influence of solar flare on sea surface target detection, a sea surface solar flare suppression method is proposed based on polarization detection technology and the difference of polarization characteristics among background water body in this paper, solar flare and typical marine targets. The effects of observation zenith angle and solar zenith angle on the polarization of sea surface targets under the background of the solar flare and the contrast between sea surface targets and solar flare background are analyzed. The results show that when detecting sea surface targets in sunny weather, the background radiation is mainly affected by the irradiance caused by the direct reflection of solar radiation from the sea surface. There is no significant difference between the visible light wavelengths of 550 nm and 670 nm in the inhibition effect of solar flare. The inhibition effect of solar flare is better when the observation zenith angle is near 53°, 50°--60° solar zenith angle direction and the sum of solar zenith angle and observation zenith angle is about 106°. This research is of great significance to improve the contrast between the sea surface target and the solar flare background image and the target detection effect under the sea surface solar flare background.