This study investigated characteristics and principles of the Hangeul Orthography. So Hangul Orthography can regulate present language and show future language. Characteristics of HO should be prescriptive, descriptive and pedagogical. Characteristics of HO should be prescriptive, descriptive and pedagogical, Prescriptive characteristic means whether HO is correct or false, descriptive characteristic means whether HO reflects present language, and pedagogical characteristic means that HO must be teaching and learning, and HO should focus presence and future. HO should include past, present, future language. Reflecting past language means that we should think language tradition, or practically speaking, HO must have chronically explaining adequacy. Including present language means that HO must have practicality of reflecting present language. And including future language means that HO should show predicting possibility of new language.