The HY-1 satellite is the first satellite for remote sensing of ocean environment in China.Because there is no onboard calibration facility and the coefficient of Chinese Ocean Color & Temperature Scanner（COCTS） has been drifting

calibrations and corrections must be carried out continually.One of the calibration methods is described in this paper.The Sea-viewing Wide Field-of-view Scanner（SeaWiFS） supplies highly accurate ocean color satellite data acknowleged internationally

its data for case I water

such as water-leaving radiance and chlorophyll concentration

etc.

is regarded as the standard by international fields on remote sensing of ocean color.Therefore

we can adopt the calibrate COCTS continually by the normalized water-leaving radiance and aerosol parameters derived from SeaWiFS.This method can also be used to monitor the long-term charge of calibration coefficient of COCTS.Our results indicate that the accuracy of the data retrieved from COCTS can be greatly improved after the cross-calibration.