My aim in this article is to show that the general way of contrasting some similarities and unlikenesses between two quite different philosophical conceptions is possible.
In section one，I discuss why Maitreya-natha wanted ted to distinct "Dharma" and "Dharmata, " and also in section two，why Heidegger wanted to reveal "Sein" from "Seienes". According to their thesis, I will show the main similarities of them.
Then in section three，I will inquire into "samvrti-satya" (the wordly truth or the mortal truth) to see how can it be justified as Heidegger's "ontical truth" (against to "ontological truth") and Maitreya-natha's "parikalpa" (against to "vibaga"). In section four，in accordance with the question of Sein as "ontological truth" and Dharmata as "Tathata" or vibaga, I contrast both with "concealment-unconcealment" and "authentic-inauthentic." Thereby we can obtain the phenomenological interpre- tation on question of Dharmanta and also the correspondant understanding of "seinsfragen" from yogacara school's view point.
Section five，in order to find out the ontological significance of distinction of Dharma and Dharmata, I will go a step further to explore the crux of sameness/unlikeness between Heidegger and Maitreya-natha. On the bssis of the crux，I may show how "Dasein" (human existance) and "sattva" (common people) was concretely derived from above distinction，and how is the "asraya -- parivti,"ie., the transformation from inauthentical to authentical existence，possible.
My conclusion are，(i) both Heidegger and Maitreya-natha express those difficult distinctions with parodoxical sentences; (ii)Heidegger disclosed the oblivion of Sein and Maitreya-natha discoved the "avidya" of common world; (iii) in the distinction of Dharmata from Dharma, there is an ontological significance which is worthwhile to discuss; (iv) both of them can justify the worldly truth and common knowledge ontologically; and finally，(v) both of them pay attention to the human existence and his authenticity，and both affirm that the human being，who complete the above distinction，is the very origin and process of his existence.
