The　results　of　theoretical　and　numerical　studies　of　coherent　stimulated　terahertz　radiation　from　intense,　subnanosecond　electron　beam　are　presented.　The　mechanism　of　terahertz　pulse　generation　is　associated　with　self-bunching　of　the　beam　and　slippage　of　the　wave　over　the　whole　electron　flow.　This　so　called　Cherenkov　super-radiance　(SR)　is　used　to　propose　a　compact　terahertz　generator　with　high　peak　power.　A　large　cross-section　(overmoded),　slow　wave　structure　is　designed　to　support　the　high　power　handling　capability,　and　the　mode　competition　is　avoided　by　operating　the　device　in　the　surface　wave　status.　With　2.5　D　particle-in-cell　simulation,　the　＂hot＂　characteristics　of　the　proposed　super-radiant　terahertz　generator　are　investigated,　and　the　numerical　results　show　that　the　SR　peak　power　could　be　further　increased　by　optimizing　the　amplitude　profile　of　electron　pulse.　Under　the　condition　of　0.5　ns　pulsewidth,　500　kV　voltage,　and　1.5　kA　current,　the　110　ps,　680　MW,　and　0.14　THz　SR　pulse　is　achieved　with　a　power　efficiency　of　90.67%　in　TM01　mode.