Two profiles on typical coastal transverse ridge, located at Changli Gold Coast zone in Hebei Province which is one of the most typical coastal Aeolian distribution regions in China and famous for the tall and typical transverse ridges, were chosen to compare the variation of distribution model of grain size on coastal dune, one profile represented the sample influenced by human activities and the other represented the sample uninfluenced by human activities. On two profiles, there were 107 sand samples collected on typical coastal transverse ridge. The parameters of grain size of samples were analyzed and calculated by use of the number of mean size, standard deviation, skewness and kurtosis. The comparison of parameters of grain size of two profiles on coastal transverse ridge show the distribution characteristics of grain size of two profiles on coastal transverse ridge are distinct different. Under natural environment, the distribution model could be concluded as that the finest and the best sorting sands distributed on the top of coastal transverse ridge, the fining and sorting on the
leeward slope are better than that on the windward slope and the coarsest sands distributed at its leeward slope bottom. Affected by the human activities, such as sliding and trampling of tourists on the top of transverse ridge as well as overturning and piling of coastal sands at the bottom of windward slope of coastal transverse ridge, the distribution characteristics of grain size on coastal transverse ridge became more fining and sorting from bottom to slope on the transverse ridges, the fining and sorting of sands on the windward slope are better than that on the leeward slope, the finest sands distributed at the windward slope and the coarsest sands distributed at the bottom of windward slope.