First of all, we review the polarization properties of solar system planets, as-teroids and Earth-like exoplanets. Then we treat the Earth as an Exoplanet, weobtained the polarization signals of ’Earth-like Exoplanet’ through PARASOLdata. We find the maximum disk-integrated polarization degrees of Earth-likeExoplanet reach 13.13%, 7.33% and 5.29% at 490nm, 670nm and 865nm respec-tively, while the minimum polarization degrees are 11.36% , 6.01% and 3.83%respectively; the variation amplitude is less than 2% in a diurnal spin period;the polarization magnitudes show a strong dependence on wavelength, generallyspeaking the shorter wavelength the larger polarization. Moreover, we modeledthe polarizations of Earth-like Exoplanet, we study the polarizations of Earth-like with Exoplanet an tidally locked cloud-(sub-solar cloud) particularly. Wefind that for phase angle less than 100 ? , the planetary reflected flux increaseswith the increase of cloud optical thickness; for the phase angle range of 100 ?to 120 ? , the flux shows no obvious variation when the cloud optical thicknessincreases from 2 to 10. As the cloud optical thickness increases, the maximumdegree of polarization occurs at larger phase angle. As the albedo of planetarysurface increases, the maximum degree of polarization occurs at larger phase an-gle. Finally, we study the relationships between asteroid polarization parametersand geometric albedo，we provide a new method to determine the more accurategeometric albedo of asteroids. The works above provide references for identify-ing the surface and atmospheric properties of planets and determining whetherplanets are habitable.
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