In　this　paper,　a　non-collinear　shear　wave　mixing　technique　is　proposed　for　evaluation　of　fatigue　crack　orientation.　Numerical　analysis　of　the　nonlinear　interaction　of　two　shear　waves　with　crack　is　performed　using　two-dimensional　finite-element　simulations.　The　simulation　results　show　that　the　nonlinear　interaction　of　the　two　shears　waves　with　cracks　leads　to　the　generation　of　transmitted　and　reflected　sum-frequency　longitudinal　waves　(SFLW),　moreover　the　propagation　direction　of　reflected　SFLW　is　correlated　with　the　orientation　of　crack,　which　can　be　used　for　crack　orientation　evaluation.　Non-collinear　wave-mixing　experiments　were　conducted　on　specimens　with　fatigue　crack.　The　experimental　results　show　that　the　directivity　of　the　generated　SFLW　agrees　well　with　the　simulation　results,　and　non-collinear　shear　wave　mixing　has　potential　use　in　fatigue　crack　orientation　evaluation.