Regarding the issue of disparate flow rates and discharge times between the upstream and downstream lateral openings of a distributed water conveyance system in a ship lock，this study relies on a mathematical model constructed based on an existing domestic ship lock.By coupling computational data with measured data，the suitability of the model is validated.The model is further modified to simulate the discharge rates of different lateral openings by adjusting their respective areas，and the discharge uniformity under various operating conditions is evaluated using variance and uniformity coefficients.The research results show that: 1) The upstream lateral openings discharge earlier，resulting in lower flow rates during the mid and late stages of water conveyance，while the downstream lateral openings discharge later but experience higher flow rates during the mid and late stages due to greater pressure at the end of the pipeline.2) The discharge uniformity exhibits an initial improvement followed by a decline with an increase in the area ratio between the upstream and downstream lateral openings.3) The area ratio of the lateral openings in the practical engineering project represents a relatively favorable scenario.