An image spherizing algorithm-baesd deformation detecting method for micro-channel plate is proposed. A rigorous mathematical deduction on image spherizing model is described in detail, subsequently a straight line image is chosen as standard picture and the imaging simulated test for deformed micro-channel plate is performed. According to the simulated results, the mechanism of image twisting phenomenon is described. At last, the deformation detection scheme of double lines method is proposed. The experimental set-up is designed and the detection standard is defined based on the simulated data and the planeness of micro-channel plate that measured by scanning electron microscope. The experimental result which obtained by interferometer showed that the actual profile characteristics of deformed micro-channel plate is consistent with the theoretical analysis. A micro-channel plate will be treat as defective product when the rotation angle of two orthogonal lines in the reflected image on the surface of micro-channel plate is greater than 40°, whereas the product will meet the military standard when the rotation angle is smaller than 7°. The accuracy of the proposed method can reach 1 μm and it has been applied to the production process of micro-channel plate.