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Conduits of water pipelines are subjected to huge internal pressure for conveying water. Cracks induced by water pollution, material defects and seismic excitation may be forming on a conduit to cause damage. This phenomenon generating stress concentration threatens the safety of a conduit. Thus, techniques to monitor the strain variation of a cracked member are essential. Based on the assumption of linear elastic material, the application of the infinitely small element analysis in a crack problem for numerical simulation was validated. Herein, this research reveals that Digital Image Correlation, DIC, technique is a new manner of surveying the practical strain distribution of a member. By the cracked cylindrical pipe test, the DIC method is used to observe the strain variation in the micro-region surrounding the crack tip. Additionally, to utilize the skills of meshing digital image into subimages increases the precision of analyzing a crack problem via the DIC method. According to the experiment in this research, the capacity of DIC method for capturing a crack progress is validated.