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In the area of seamless global communication coverage design,space information infrastructure has attracted extensive attention in recent years.Because of the multiple gigahertz broad bandwidths,the low atmosphere attenuation of signal in space environment and the high speed of transmission,terahertz wireless communication has great potentials in space applications.In this study,terahertz wireless communication between the two satellites is explained in detail.The APT of terahertz antenna,the high speed modulation and demodulation system and the compact micro-module of the transceiver front are analyzed in this application.