Hydrological connectivity is one of the driving factors influence both hydrological and ecological processes in coastal wetlands. In the current study, we used Scale-free Network Model to improve the soil water-topography based static hydrological index, developed for the point (1 m²) and plot scale (100 m²), and parameterized landscape-scale (100 hm²) hydrological connectivity in four wetland classes in the Yellow River Delta and analyzed the scale effects. Results showed, similar with point and plot scales, the inter-tidal flat wetland and artificial reed (Phragmites communis) swamp have relatively stronger hydrological connectivity than tidal marsh and river side wetlands. The hydrological connectivity variation in the landscape scale is higher than which in the other two scales and in areas with higher hydrological connectivity, the spatial variation comes from plots with higher indices and vice versa. The parametrization methods as well as hydrological process heterogeneity are the main reasons for the spatial variation:for point and plot scale, the method focused on the spatial configuration of the soil water content in the target sample and perimeter area which is merely influenced by the tides or other hydrological processes. The landscape method is targeting on the whole study area which is mainly influenced by the hydrological processes.