This article figures out the original Chinese characters of Sino-Korean words “tsu-sek(주석)” and “tsu-par(주발)”. In modern Korean, “tsu-sek” mainly means “tin”, “tsu-par” means “a brass bowl”. Generally, they are written as “朱錫”and “周鉢” in Chinese characters. In the current Sino-Korean pronunciation system, it is normal to read “朱錫” as “tsu-sek”, and “周鉢” as “tsu-par”, but the meaning of each character doesn’t match the actual word itself. According to the meaning of each character, historical records and the phonological correspondence, this article confirms that the original Chinese characters of “tsu-sek” and “tsu-par” are “鍮石” and “鍮鉢”.