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The main tracking targets are C-and S-band spacecrafts when TT&C ships carry out maritime tracking and control task. Due to the limited space on board, several sets of different bands antenna can’t be installed wholly on the ship board. So it is necessary for the C-and S-band antennas sharing the same feed system. For the C-and S-band antenna feed system, the C-band primary radiator adopts a single horn, which products a differential mode consisted of TE01 mode, TE21 mode and TM01 mode; the S-band primary radiator four horns with the differential mode signal consisted of the signals producted by all horns. With computer-aided design, the geometries and sizes of the reflector and horn were determined. Simulation and measurement results show that the radiation patterns and the gain in dual bands can satisfy the specifications. Its compactness and miniaturization facilitate TT&C ships.