Based　on　the　safety　problem　of　comprehensive　mechanical　mining,　taking　shield　beam　and　base　of　hydraulic　support　as　the　research　objects,　the　residual　stress　level　is　estimated　by　X-ray　method.　Tests　were　carried　out　on　shield　beam　and　base　twice　before　and　after　heat　treatment,　and　each　component　was　selected　multiple　areas　(more　than　40　measuring　points)　to　get　the　overall　level　of　residual　stress　and　its　distribution.　The　results　indicate　that　welding　residual　stress　in　base　is　higher　than　that　in　shield　beam　before　heat　treatment,　the　maximum　value　is　429.4　MPa(0.62　ReL),　while　the　maximum　value　in　shield　beam　is　348　MPa(0.50　ReL).　After　heat　treatment,　the　residual　stress　level　decreases　significantly,　the　maximum　values　of　base　and　shield　beam　decrease　by　37%　and　71%,　respectively;　and　the　average　values　decrease　by　46%　and　76%,　respectively.　The　results　show　that　new　heat　treatment　process　has　significant　effect　on　reducing　residual　stress.