Abstract: Pump stations are widely used and consume huge amounts of energy. Parallel pump stations are a common arrangement of pump stations. Research on optimal flow distribution schemes for parallel pump stations is of great significance to energy saving and consumption reduction in pumping stations. However, in current researches, electricity costs are considered too much, and the consideration of non-electricity costs is insufficient. In this paper, considering the electricity costs and other non-electricity costs, the dynamic programming method is used to construct the optimal flow distribution model between parallel pump stations considering the cost of non-electricity water transfer.Two stations in Suining are operated in parallel. The application results show that:（1） when the proportion of non-electricity cost is low, it has no effect on the traffic optimization scheme, and when the proportion of non-electricity cost reaches the threshold of 65%, it has a strong guiding effect on the distribution scheme.（2） When the proportion is low, the hardware constraints of the units determine the flow distribution method between the parallel pump stations. However, as the proportion of non-electricity cost increases, the influence of unit hardware constraints is weakened, so that non-electricity cost begins to dominate the inter-station flow distribution method of parallel pump stations, and this change first occurs in the case of high lift. The findings show that after reaching a certain threshold, the non-electricity cost has an important impact on the optimal operation plan of the pumping station group, and it needs to be included in the optimization objective in the optimization scheduling process.