Recently, the frequent storm flood has become the main hazard in the coastal cities, which treats to the regional sustainable development. Land use change has transformed the original landscape structure and hydrological processes, and also becomes the significant factor to the increase of urban storm flood disaster risk. It is significant to discuss on the relationship between the land use change and the storm flood hazard risk. Based on the CLUE-S model, the SCS model and the equal volume submerged algorithm, this article took the Maozhou Watershed as the study area and quantitatively evaluated the storm flood disaster risk in the twelve interactional scenarios of the storm hazard and the hazard affected land use. Results showed that the urban storm flood hazard risk increased remarkably with the increased storm magnitude on a certain pattern of land use. While at the same level of the storm hazard, the areas of medium and high risk patches showed an obvious increasing trend with the increased construction land. The area increasing rates of high or medium level risk patches and the construction land were highly-related with the form of synergy. Take the recurrence interval of 50years as an example, the area of high risk patches grew from 254.07hm² to 276.48hm² and 286.2hm² when the construction land area increased from the base scenario to short-term and long-term scenario, respectively. Therefore, even though the significant factor to the storm flood disaster risk is the storm magnitude, the influence of land use change characterized by the increasing of construction land on the storm flood disaster risk cannot be ignored.