The time interval of gifts varies according to the type of exchange. In Liangshan Yi society, "Kabba" presents the characteristics of immediate return, while "Lypu" buries the time interval of return in a voluntary exchange, and the time interval of return of "Lolyt" is influenced by the principle of return. Thus, the existence of the return time interval is not because of the negation of the transaction, nor the condition for the return of interest. It is only affected by the principles and cultural concepts of different exchange types.