In this paper a kind of single phase lock loop based on cascade signal delay cancellation was proposed to deal with the synchronization of single phase grid under undesirable grid environment. Frist, only one phase signal is considered as input of Park-transformation while the others are kept zero. The features of output are analyzed at the same time. For tracking the amplitude, phase and the frequency adaptation of grid fundamental component fast and accurately. Within the frequency feedback loop the cascade signal delay cancellation method can eliminate adverse effects in output of synchronous reference frame transformation under fault grid condition such as DC component, harmonic, phase jump, etc. This method needn’t construct virtual orthogonal signal. Proposed algorithm is simple and easy implement. The effectiveness of the proposed method is verified by simulation and experiment results.