Because conventional three-dimensional digital image correlation （3D-DIC） equipment cannot be used to fully measure the deformation field of the partial surface of an aero-engine， a mirror-assisted muti-view measurement method is proposed and a set of multi-view 3D deformation measurement systems is constructed. The proposed method includes a high-precision camera calibration model， a correction method for reflection imaging， and a classical digital image correlation algorithm. In addition， using a photogrammetric technique， the method can align the measurement data of multiple 3D-DIC units to a common coordinate system to obtain multiple 3D shape and deformation fields simultaneously. The accuracy of the proposed method is verified through a specially designed uniaxial tensile test， where the accuracy of shape reconstruction is 0.03 mm， and the error of strain measurement is less than 50 με. Finally， the proposed system is applied to the loading test of an aero-engine casing. The shapes and corresponding deformation fields of multiple ribs of the casing are measured successfully， the results of which are consistent with those of finite element simulations. The results all demonstrate that the method is suitable for multi-view measurements of aero-engine casing deformation and has important engineering value for the structural designs and strength tests of complex cavities.