This work is primarily an interpretation of Indian Logic preserved in China. The material is mainly taken from K`uei Chi`s Great Commentary on the Nyayapravesa. It is not design to be a comprehensive study of Indian Logic in general, nor is it planned to be a complete exposition of K`uei Chi`s work in particular. Its scope is confined to formal Logic. The author`s intentions are to solve problems which have not yet been settled and to interpreted, instead of duplicating what other people have already done. Much more atttention has been made to fundamental principles and less to the list of fallacies, in particular less to the overelaboration which does not make much sense either theoretically or practically.