When calculating the connection between pipelines, aiming at the problems of large value of loss constraint, a small value of pressure, and inaccurate water hammer effect, the hydraulic calculation, and water hammer analysis process of large drop and long-distance municipal water transmission and distribution system are designed. The triangular curve grid processing pipeline is set as a grid structure from sparse to dense, and the normal imaging numerical relationship is used to control the pipeline constraint conditions Then, a long-distance water transmission and distribution system is set as a grid structure, and the large drop condition is defined. After the elevation value of the pipe centerline is calibrated by using the large drop hydraulic calculation algorithm, the numerical relationship of the water hammer effect is constructed to complete the process analysis. The test results show that the hydraulic calculation error is controlled at about 0.07%, the water level error is controlled at 0.1cm ~ 2cm, and the difference between the pressure value and the measured standard value is less than 2N.
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