Abstract: During service period, long-distance buried pipelines may suffer from corrosion, from cracks, and from mechanical damage, necessitating pipeline replacement construction. After the pipeline is cut, stress is released, causing misalignment at the pipe ends, which complicates the reconnecting process. Thus, accurately evaluating the post-cutting misalignment is crucial for enhancing the efficiency and quality of the reconnecting work. In this study, based on the stress detection results of the Longitudinal Critically Refracted wave (LCR wave) and on strain monitoring data, a theoretical model for calculating the misalignment after pipe cutting is established. Consequently, a calculation method for the misalignment of buried pipelines after cutting is proposed. Taking a pipe-replacement operation of the China-Myanmar natural gas pipeline as an example, axial stress of the pipeline before cutting was measured, and strain was monitored before and after the cut. The calculated misalignment values using method proposed were compared with on-site measurement results. The findings indicate that the relative error between the misalignment values obtained via LCR wave stress detection and ones on-site measurement is as low as 1.17%. This comparison confirms the accuracy of the calculation method proposed. It demonstrates that the LCR wave stress detection method can effectively and precisely calculate the pipeline misalignment before pipe replacement, showing great reliability and application potential in pipe-replacement construction.