本文於前人對北京故宫博物院圖書館藏一部藏傳密教修行密典——《究竟定:清宫藏密瑜伽修行寶典》所做研究的基礎上,進一步考察這部清代秘藏之宫廷瑜伽法本所傳密法之實際内容,並結合我們於遼寧省圖書館發現的一部西夏或元代編譯的漢文藏傳密教文獻殘卷抄本,即羅振玉於清内庫大檔所集《演揲兒法殘卷三種》中所見之相關資料,來更精確地説明這部清代宫廷瑜伽法本所傳藏傳密法的真實内容,並進而揭示它與傳爲元代蒙古宫廷内所演練的、臭名昭著的“演揲兒法”之間的關係,還蒙元時代藏傳佛教於中原之傳播的本來面貌。 Based on the previous research on the secret code of Tibetan Buddhism practice in the Palace Museum in Beijing, this paper further examines the court yoga of secret possession of the Qing Dynasty The actual content of the law of confidential law, and combined with our library found in Liaoning Province, a Western Xia or Yuan Dynasty compiled translation of the Chinese Tibetan secret documents, that is, Children’s Law “in the three kinds of material seen in the relevant information to more accurately illustrate the Qing court yogamy pass the contents of the real law, and then reveal it with the pass as the Mongolian court during the Yuan Dynasty exercises , The infamous ”Act 揲 child law ", but also the original appearance of the spread of Tibetan Buddhism in the Central Plains during the Mongolian Yuan Dynasty.