The　efficient　production　of　energetic　gamma　photons　is　a　significant　physical　process　in　the　relativistic　ultrashort　pulse　laser-plasma　inducing　photonuclear　action.　Based　on　the　interaction　of　laser-solid-target,　an　analytical　theory　on　stimulated　gamma　photon　emission　from　a　hot　electron　Bring　the　target-nucleus　is　developed　by　a　relativistic　full　quantum　method.　The　emitting　power　or　probability　of　gamma　photon　in　arbitrary　space　direction　can　be　calculated　for　laser　irradiating　solid-target　normally.　It　is　valid　only　if　the　scatter-centre　is　immovable　or　its　motion　can　be　neglected　compared　with　that　of　the　scattered　electrons.