The High Energy cosmic Radiation Detection facility, HERD, is proposed for the observation of high-energy electrons, gamma-rays and cosmic-rays onboard China's Space Station. The HERD has a capability to observe the electrons (without separation between e+ and e-) and gamma-rays in 10 GeV-100 TeV and the cosmic-rays in 100 GeV-1000 TeV with high energy resolution . The HERD is advantageous in terms of energy resolution, geometrical factor and energy detection range.