This paper gives a historical review of various issues brought up in standardization of Korean language. It consists three parts. First, it points out the importance and necessity of standardization of Korean language. The second part reviews the historical development of Korean standardization in South Korea, North Korea and China respectively since 1945 and points out the problems raised in standardization of Korean language used in China. Confusion is mainly caused by applying two different kinds of Korean standardization：one for Korean Chinese which follows Chinese standardization and another one for Korean education targeted foreigners who study Korean. The third part gives the possible solutions, which is either regulating a new way of standardizing, or adopting either South Korean or North Korean standardization, or a unified way neutralizing the standardization of Korean language used in both South Korea and North Korea. This paper argues that Korean standardization should adopt the third proposal；it also brings up two key issues that need to be sovled in this new proposal. At the end, the author urges scholars in both South and North Korea to speed up the process of Korean standardization with the spirit of mutual understanding for the sake of ensuring the identity of Korean language as well as further cultivation of Korean culture.