Shanghai Laser Electron Gamma Source, a $gamma$-ray beam line of 10MeV order was proposed recently. The beam line is expected to generate $gamma$-ray with maximum energy of 22MeV by backward Compton scattering between CO$_2$ laser and electron in the 3.5GeV storage ring of future Shanghai Synchrotron Radiation Facility. The flux of non-collimated $gamma$-ray can be 10$^9$ $sim$ 10$^{10}$s$^{-1}$ if a commercial CO$_2$ laser of 100W order output power is employed and injected with optimized settings.
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