Adhesive　joints　are　extensive　used　in　various　industrial　applications.　Bonded　quality　is　crucial　for　ensuring　structural　integrity　and　safety.　In　this　study,　the　nonlinear　non-collinear　wave　mixing　techniques　were　developed　to　nondestructive　evaluate　micro　imperfections　in　adhesive　joints,　including　adhesive　degradation　and　bond　weakening.　Two　testing　schemes　were　proposed　via　the　resonance　conditions　of　the　adhesive　and　substrate　respectively,　following　the　classical　nonlinearity　theories.　Numerical　simulations　and　experiments　of　non-collinear　wave　mixing　were　conducted　to　explore　the　feasibility　of　the　proposed　testing　schemes　for　accessing　two　typical　micro　imperfections　in　adhesive　joints.　Both　the　simulation　and　experimental　results　demonstrate　that　the　proposed　nonlinear　non-collinear　wave　mixing　method　is　effective　for　nondestructive　evaluation　of　the　micro　imperfections　in　adhesive　joints.　Moreover,　the　scheme　via　resonance　conditions　of　adhesive　exhibits　a　higher　sensitive　to　the　adhesive　degradation,　whereas　the　one　relying　on　the　resonance　conditions　of　substrate　exhibits　a　higher　sensitive　to　bond　weakening.