Coastal　cities　play　a　significant　role　in　regional　economic　development　and　national　water　resource　supply.　However,　the　shortage　of　water　resources　in　coastal　cities　has　become　a　bottleneck　for　sustainable　economic,　social　and　ecological　development.　As　a　typical　coastal　city　in　Liaoning　province,　China,　Yingkou　has　a　relatively　developed　economy,　but　faces　increasingly　serious　water　shortages.　Taking　Yingkou　as　a　case　study,　this　study　analysed　the　current　situation　of　urban　and　rural　water　supply　and　conducted　a　rational　estimation　of　the　water　supply　and　demand　based　on　the　time　series　method　in　the　short-term　(2025)　and　long-term　(2035).　Then,　the　allocation　of　urban　and　rural　water　supply　was　carried　out　on　the　principle　of　priority　use　of　surface　water,　sufficient　use　of　diverted　water,　expanding　use　of　unconventional　water　and　limited　use　of　underground　water.　To　achieve　the　optimal　scheme,　the　method　of　＇allocation-feedback-regulation-reallocation＇　was　adopted　to　coordinate　the　water　sources　and　consumption　in　different　districts　and　sectors.　Overall,　the　results　clarified　the　red　line　of　water　consumption　in　2025　and　2035　and　defined　water　consumption　and　water　sources　in　different　sectors　and　districts.　Finally,　the　water　supply　and　demand　balance　in　Yingkou　and　its　subdistricts　was　achieved　with　surplus　water　rates　of　6%　and　7%　in　2025　and　2035,　respectively.　Based　on　these　results,　suggestions　for　the　sustainable　development　and　utilization　of　water　resources　in　Yingkou　and　coastal　cities　were　proposed.