Abstract: We propose a non-recursive minimum discontinuity phase unwrapping algorithm for improved efficiency. After analyzing the principles of minimum discontinuity phase unwrapping algorithm, a stack is used to store the intermediate results during edge spreading and circle canceling processes and thena non-recursive algorithm for phase unwrapping is implemented. The new algorithm was combined with the quantized quality-guided phase unwrapping algorithm, which enhances the unwrapping efficiency by restricting the optimization area. Unwrapping tests performed on InSAR and InSAS interferograms show that the proposed method maintains high quality unwrapping results and greatly improves efficiency.