Che(彻)used to have a grammatical function as a complement in the history of Chinese,but it is less used in modern Mandarin Chinese.By analyzing the history of the evolution with respect to the complementary function of Che(彻),it is found that the variety of complementary types originated from the gradual evolution of meanings and the derivation of syntax under the effect of disyllabification.After the increasing lexicalization of two-tone,due to the complexity of its own grammatical system and ambigu-ous semantics,and the inhibition of typical members of the complement system,the complementary phrase Che(彻)was partially solidified into words.The essence of the unbalanced decline of complement Che(彻)is the difference in the semantic cognition of meanings.