ABSTRACT: Yen-Liao beach located in the northeast coast of Taiwan is a popular coastal park for recreational activities. The beach was found to be receding after typhoon Sinkler landed in 2002. The reasons for this were somewhat in dispute. In order to see how the beach changes over time, comparisons between the results of a series topographic surveying from 2004 to 2007 were made. It demonstrated that a shore-term change of the beach profile was due to significant meteorological events such as typhoon passages, and the long-term evolution of the beach profile was dominated by monsoon waves.