Aiming at the application of remote sensing satellite for multi-band and multi-polarization detection, a quasi-optical feed system which is the important device of millimeter-wave radiometer antenna on satellite is designed. This feed system can respectively receive the electromagnetic signals at 54?GHz and 183?GHz to complete the effective detection of earth atmospheric and humidity. Each frequency band has H/V polarization. The quasi-optical feed system is constructed and simulated. The simulated results can meet the requirements on antenna system. The far-field radiation parameters of prototype, like taper angle, cross-polarization, beam efficiency, are measured. The measured results demonstrate that the proposed feed-system has a good performance and its feasibility and rationality are verified.