Abstract: The Shepan Island, which covers a total area of 19.68km2, is a small island with profound historical ground in the Sanmen bay Shepan ocean in eastern Zhejiang Province. The southern part of the island close to the sea is Linglong Mountain of volcanic detritus of the upper Jurassic, and loose sediment of quaternary that is about hundreds of meters long in the south. On its eastern side, the outcrops of the volcanic eruption were found, sea cliff were formed by the geological effect of the waves. A dark, shiny sea mudflat that is about a few tens of meters wide reveals on the beach after the ebb tide. According to the determination, the amount of selenium in sea mud is high, and the small seafood in sea mud, such as clam, which is used to be caught and eaten, can replenish healthy organic selenium. Riding a wooden seahorse and catching small seafood are two features of tourism development of the Shepan Island slime park. In addition, the agglomerates found in the southeast corner of Linglong Mountain can provide evidence for the direction of the crater, which is of scientific value.