《解深密經》是瑜伽行派的最根本經典，其「三時判教」說是印度佛教判教思想展開的主要前提之一，更是瑜伽行派的判教準則。但《解深密經》的梵本不存，對其判教思想的直接研究只能借助於漢譯本與藏譯本進行。本文試圖根據漢譯與藏譯的「三時判教」幾段譯文，進行對比分析，以顯示二者思想的異同，由此可更好地體會《解深密經》的判教意趣。

The basic sūtra of Yogācāra School is Samdhi Nirmocana Sūtra, whose thought of “Three Period Teaching Classification” becomes one of the basic prerequisites for the development of Indian Buddhist thought about teaching classification, especially the criterion for the teaching classification of Yogācāra School. This paper tries to carry on a comparative analysis to the two Chinese and one Tibetian texts of “Three Period Teaching Classification ” of Samdhi Nirmocana Sūtra, in order to make a deep inquiry dhi for the significance and intention of the teaching classification of this sūtra.