This　article　attempts　to　analyze　systematically　the　residue　stress　issue　in　high　pressure　gas　cylinder　used　for　compressed　natural　gas　by　studying　the　residue　stress　condition　of　the　cylinders　during　their　manufacturing　process　until　they　are　put　into　service.　The　residue　stresses　conditions　were　tracked　throughout　the　process　of　fabrication　of　a　high-pressure　gas　cylinder.　Residual　surface　stresses　were　measured　at　the　same　locations　in　gas　cylinder　by　X-ray　diffraction　after　gas　cylinder　was　forged,　quenched　and　tempered.　Additionally,　stress　conditions　were　tested　by　metal　magnetic　memory　method　in　order　to　execute　early　diagnostics　of　the　inspection　object　before　each　X-ray　diffraction　tested.　There　is　a　comparison　of　two　kinds　methods.　As　a　result,　residual　stresses　were　decreased　after　gas　cylinder　was　heat　treatment.　The　maximum　value　of　residual　stresses　in　gas　cylinder　was　less　than　0.17σs　after　tempering,　and　stress　condition　in　all　the　gas　cylinder　were　uniformity　and　it　is　shown　that　heat　treatment　made　good　effect.