《高野杂笔集》是日僧空海的书信集,现存最古的抄本是日本承安元年(1171)劝修寺理趣院范杲的抄本,现藏日本大谷大学图书馆。《高野杂笔集》下卷末尾收录了18封唐人书信,其中包括僧云叙、僧真寂、弟子李璘、僧志圆、僧法满、清凉山僧无无写给义空的书信各一封、赵度写给义空的书信两封、徐公祐写给义空的书信五封、徐公祐写给侄子胡婆的书信一封、徐公直写给义空的书信两封以及写给义空和道昉的书信一封。还有廖公著写的书信一封,收件人不详。书信的作者包括唐代僧侣、地方官员、唐日贸易商人,收件人主要是渡日唐僧义空。这些唐人的书信在《全唐文》、《唐文拾遗》等中国文献中均未收录,可以为增补全唐文提供珍贵的新史料。此外,其中收录的五封唐商徐公祐写给义空的书信更是为九世纪中后期遣唐使实际停止后的中日贸易研究提供 Takano miscellaneous set “is the monk Konghai sea letters, the oldest surviving transcripts is the first year of the Japanese Association (1171) persuasion Temple Court Fan Fan copy, is hidden in Japan Otani University Library. At the end of the volume titled ”Tetsuya Takanori“, there are 18 epistolary letters written at the end of the volume, including monk Yun Syria, monk Shinsei, disciple Lee Min, monk encyclopedia, monk Dharmaman, One letter, Zhao degrees wrote two letters of righteousness, written by Xu Gongyou letters of righteousness five, written by Xu Gongyou nephew Hu Po an envelope, Xu Gong wrote to the nirvana two letters and writing righteousness Empty and Road 昉 a letter. Liao Gong also wrote a letter, the recipient is unknown. Authors include the Tang Dynasty monks, local officials, traders in the Tang Dynasty, the recipient is mainly the Tang Dynasty Monk Yoshitaka. The letters of these Tang people were not included in Chinese literature such as ”Full Tang Wen“ and ”Tang Wen Ji Ji Yu", which could provide precious new historical materials for supplementing the whole Tang Wen. In addition, the five letters collected by the Tang merchants, Xu Gongyou, wrote a letter to the world for the study of Sino-Japanese trade after the actual suspension of the Tang Dynasty in the late nineteenth century