There are some controversy about some undersea feature terms in China for our government take park in naming undersea feature late and lack of practical experience. We discuss about these terms by comparing some authoritative geological dictionaries and standards from both home and abroad, finally we get the following conclusions: ① Shoal(“An sha”)is an isolated (or group of) offshore hazard(s) to surface navigation with substantially less clearance than the surrounding area and composed of unconsolidated material.Bank(“Tan” or “Qiantan”) is an isolated (or group of) elevation(s) of the sea floor, over which the depth of water is relatively shallow, but sufficient for safe surface navigation. ② Most of the authoritative geology dictionary and standards definite relief of “Seamount” must be greater than 1000m, but there are still a lot of controversy about definition of“Hill” and “Knoll”, SCUFN making no distinctions of each other. ③ The main differences of “Canyon”(Haidixiagu) and “Valley”(Haidigu) is the shape of cross sections, not magnitude. Different geology dictionary has different translation for the term of “Seachannel”. Recent years, most of the academic papers translates it to “Haidishuidao”.It is more easy to separete it from “Haidixiagu” and “Haidigu”. ④ “Haitai” and “Haidigaoyuan” are often used as the translation for “Plateau”,and there is no any difference between them.