High-order conservative remapping method is developed to improve flow information exchange accuracy of window embedment technology on non-matched grid-block interface with preservation of conservative property and robustness.Remapping methods with various order of accuracy combined with various stencil selection strategy are compared.Constant distribution,linear and quadratic polynomial distributions are tested for reconstruction of conservative variables on interface.Accuracy and efficiency of linear polynomial WENO remapping are balanced well for engineering application.Numerical study of DLR-F4 wing-body configuration with a mending plate patched on the wing is conducted by a in-house developed code NSAWET.A sharp pressure jump brought by the mending plate is predicted.