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We introduce the mission concept of TIANQIN, a spaceborne gravitational waves detector. TIANQIN consists of three drag-free satellites, forming an equilateral-triangle constellation and orbiting Earth with an altitude of about 60,000 km, as shown in Fig. 1. The major scienti_c goal of TIANQIN is to detect possible gravitational radiation from Hm Cnc (RX J0806.3+1527), a candidate ultracompact white dwarf binary with a putative orbital period of about 321.5 s. Based on current best models of the binary system, we expect SNR=5 after 3 month of observation