Abstract: The calcareous nodules widely distributed on the sea bed of shallow water in the Yellow Sea and the East China Sea，especially in the Haizhou Bay of the Y e1- low Sea，are a special carbonate deposit，which is found usually in the marine geological in vestigation or in operating by fishing vessels. They have not a certain shape and the diameter rang is from less lmm to several tens cm. There are a lot of organisms living on the nodule.Some of organisms make a lot of round holes on the nodules. Many researchers show interest in the nodules existiag on the sea bed but they have great divergence on their origin, some considered that the calcareous nodules sliould be suthigenic on the sea beds so m e said that their existing relates to the leaching of the matter in the Old Huanghe T fiver during the tow sea levels others held that the nodules should belong to the mical deposit, etc, In fact, so far as our information goes, the calcareous nodules are the continental loess doll su- merged by the sea water.