This paper is based on the author s recent studies upon the Buddhist logic(Het- uvidyā)as preserved in China.It s aimed at bringing into light the fundamental differ- ences between Dharmakīrti s deductive system and Dignāga s non-deductive system.In it,the author tries to give his answers to a series of key questions raised in our contem- porary studies on Buddhist logic.The main points of this paper can be summarized as follows: 1.By taking Xuanzang s famous argument for the mere-consciousness theory (Vij饩...