In　order　to　study　the　residual　stress　of　Al2O3　ceramics　and　kovar　alloy　after　brazing,　this　article　conducted　both　X-ray　diffraction　and　strain　gauges　measurement.　Using　Stress　diffractometer　and　constant　strength　beam　calibration　method　to　examine　the　x-ray　diffraction　characteristics　of　these　two　materials.　And　compare　measured　results　and　theoretical　results.　It　is　shows　that　the　Al2O3　ceramics　has　two　obvious　diffraction　peaks　in　140°~170°,　where　the　diffraction　peak　at　2θ=153°　can　reflect　the　changes　of　stress　more　accurately　then　one　at　2θ=146°.　For　kovar　alloy,　there　is　only　one　diffraction　peak　at　2θ=149°　in　range　of　140°~170°　and　it　has　good　linear　relationship　with　stress.　©　2016　Trans　Tech　Publications,　Switzerland.