Abstract: A C-band frequency agile，compact altimeter transceiver is introduced in the paper，It contains receive channel，transmit channel，frequency modulation source，frequency agile source and delay line，It is the important part of the equipment used for measuring altitudes at airborne and missile-borne surroundings. The C-band altimeter transceiver developed under the general requirements of small size，light weight，low power consumption，environmental adaptability， and other characteristics to meet the needs of users，provides a good template for the same type of product design.