This dissertation observed the nominalizer `-m, -ki` changes until the moderm language. The contents discussed here can be summarized as the following. In 2 chapter Examined distribution special quality of two postpositions. While `-m` took charge main function of the postposition in the nominalizer historically, Action that two postpositions expand area of each other since 16th century that `-k` appears began to appear. At the same time, Two postpositions expanded area of each other by intention to expand peculiar meaning area of each other. Change Direction of two postpositions that examine in 3 chapter showed by 3 cases as following. First, Case fixed as `-um`, After start in `-m`. Second, Started in `-m`, but after `-ki` and `-m` preserve relation of coexistence at middle time, Case fixed as `-um` again. Finally, Although is equal with second, Case fixed as `-ki`. Thus, Research about change process of two postpositions may become good clue that can forecast What postposition may be selected predominatingly between `-um` and `-ki` in a modern language.