Abstract: This paper introduce a kind of RF receive unit that can not only receive GPS 1575.42MHz signal, but also receive GPS L2,L5,Beidou B2,B3 signal and some carrier coming from high-flying balloons. The RF receive unit will be used in Shanghai word EXPO to receive some business date that is transmitting from high-flying balloons. This machine is double-band and multi-frequency machine, It has a wide range of applications, especially suitable for measuring precision positioning .Using it is very convenient.