Based on the conclusion drawn in Yuishikiron dōgakushō by Ryōsan, this paper explores the academic controversies between the Northern Temple and the Southern Temple of Japanese Dharmalakṣaṇa school and pays close attention to four focal points, of which the controversies lay on Vijñānavādin or Hetuvidya. In author's opinion, the Japanese Dharmalakṣaṇa school, derived straight from the Chinese Vijñānavādin school of Tang Dynasty, has formed its unique question consciousness and stream of thought through these academic controversies. Correspondingly, insights on these pertinent literatures can contribute to the expansion toward width and depth in the theories on Chinese Vijñānavādin and Hetuvidya.
