In September 2021, China successfully launched the Gaofeng-5(02) satellite (GF-5(02)), which is equipped with a directional polarimetric camera (DPC) and a high-precision particulate observing scanning polarimeter (POSP), forming a "polarization crossfire" observation program. In order to evaluate the in-flight radiation performance of the DPC sensor loaded on GF-5(02) satellite, based on the DPC and POSP observation data in January 2022, two methods, ocean Rayleigh scattering and "polarization crossfire" cross-calibration between DPC and POSP, were used to achieve the absolute calibration in-flight and the relative radiometric consistency test in the field of view of DPC. The results show that compared with the laboratory calibration results before launch, the absolute radiometric and relative radiometric response of DPC/GF-5(02) after launch have not changed significantly, the absolute calibration coefficient of each band changes less than 5.3% after launch, and the change of relative radiometric response in the field of view is less than 2%. Specifically, the absolute calibration coefficients obtained by the two methods of Rayleigh scattering and cross calibration (DPC and POSP) at 443 nm band have a high consistency, with a deviation of about 2%, while the calibration results of the two methods at 490 nm and 670 nm bands have a large deviation, with a deviation of 7.4% and 7.7%, respectively. Overall, the radiation stability of DPC/GF-5(02) after orbit is better than that of DPC/GF-5.