1956～1957年1956年3～4月，无言先生全家由沪迁京。中医研究院首任院长鲁之俊与先生面谈工作，嘱其与于道济先生主持编审室(数年后改名为中医文献研究室)工作，室内成员有上海陈苏生、浙江谢仲墨、扬州耿鉴庭等先生。
1956年夏迄1957年秋，先生主要参加建国后全国九种中医教材的审订，为提高教材的质量倾注了心血。他更多的是对《伤寒论》《金匮要略》和《中医外科学》三种教材负责予以审改，为各中医院校编写教材奠定了学术基础。当时并应聘承担卫生部全国第一届西医学习中医研究班的《金匮要略》等课程的主讲人之一。
1956年10月，先生为其子瀛鳌在西医系统学习中医的基础上，能达到“术业精进”的目的，提议拜在其同道、挚友秦伯未先生(当时任卫生部中医顾问)门下，秦先生欣然接受这个提议，并在数年后师生合作编写、重订《内经类证》刊行于世。
1958年是时正值全国“反右”斗争的后一年，先生因所谓“右派言论”由中医研究院调至北京中医学院任教。当时已患有高血压，体况欠佳，教学课时不多。
1959～1962年先生参加北京中医学院“十大经典医著”的编纂、设计，由于身患高血压，实际工作做得不多。先生并在数年内承担一些中央领导的医疗、会诊工作。
1963年是年9月6日忽患脑溢血，急送北京中医学院东直门医院内科抢救，因出血量多，于9月7日病逝，享年63岁。
后记无言先生生平业医45年，在中医临床、教学和学术研究等方面，均有较大的贡献。除医事外，先生对文学、史学亦有深邃的研究，特别是对《史记》和《汉书》，曾欲撰写专著，因不幸早逝，未能如愿。生平素喜吟泳，曾将建国前后所撰诗数百首，分别编为《愚盦诗草)八小册(自印本)分赠亲友、同道和学生辈。
作为从事中医教学30余年，受教的学生遍布全国，生徒中如何任、颜德馨、薛盟、曹向平、袁正刚、裴慎、庞泮池、董平、张鸿祥、巫君玉等，均为具有广泛影响的名医；子庆鳌、瀛鳌，女竹君、蕙君亦传其业。
From 1956 to 1957. In March and April of 1956, Mr. Yu Wu Yan's entire family relocated from Shanghai to Beijing. Lu Zhijun, the first president of the China Academy of Chinese Medical Sciences, met with Mr. Yu to discuss work matters, instructing him to co-head the Editorial Review Office (renamed the Traditional Chinese Medicine Literature Research Office several years later) together with Mr. Yu Daoji. The office members included Mr. Chen Suseng from Shanghai, Mr. Xie Zhongmo from Zhejiang, and Mr. Geng Jianting from Yangzhou.
From the summer of 1956 to the autumn of 1957, Mr. Yu mainly participated in the review and revision of nine national TCM textbooks compiled after the founding of the People's Republic of China, pouring his heart into improving the quality of these textbooks. He took particular responsibility for reviewing and revising three specific textbooks: *Shanghan Lun* (Treatise on Cold Pathogenic Diseases), *Jinkui Yaolue* (Essential Prescriptions of the Golden Cabinet), and *Zhongyi Waike Xue* (TCM Surgery). This laid an academic foundation for textbook compilation at various TCM colleges and universities. At that time, he was also invited to serve as one of the main lecturers for courses such as *Jinkui Yaolue* in the National First Western Doctors Learning TCM Study Class organized by the Ministry of Health.
In October 1956, to help his son, Yu Ying'ao, achieve "advanced proficiency in his specialized field" based on his systematic study of TCM within the Western medical system, Mr. Yu proposed that he become a disciple of Mr. Qin Bowei, a colleague and close friend (who was then serving as a TCM Consultant to the Ministry of Health). Mr. Qin happily accepted this proposal. Several years later, the teacher and student collaborated to compile and revise *Neijing Leizheng* (Classified Syndromes of the Inner Canon), which was published.
In 1958, during the second year following the nationwide "Anti-Rightist Campaign," Mr. Yu was transferred from the China Academy of Chinese Medical Sciences to teach at the Beijing College of Traditional Chinese Medicine due to alleged "right-wing remarks." By then, he had already suffered from hypertension and his physical condition was poor, resulting in few teaching hours.
From 1959 to 1962, Mr. Yu participated in the compilation and design of the "Ten Classic Medical Works" at the Beijing College of Traditional Chinese Medicine. However, due to his hypertension, he did not perform much actual work. Additionally, over several years, he undertook some medical treatment and consultation duties for central government leaders.
In 1963, on September 6th of that year, Mr. Yu suddenly suffered a cerebral hemorrhage. He was urgently sent to the Internal Medicine Department of Dongzhimen Hospital affiliated with the Beijing College of Traditional Chinese Medicine for rescue efforts. Due to the large volume of bleeding, he passed away on September 7th at the age of 63.
Postscript: Mr. Yu Wu Yan practiced medicine for 45 years, making significant contributions to TCM clinical practice, teaching, and academic research. Beyond his medical career, Mr. Yu had profound research interests in literature and historiography, particularly regarding the *Records of the Grand Historian* (*Shiji*) and the *Book of Han* (*Hanshu*). He had intended to write monographs on these topics but died prematurely, leaving his wishes unfulfilled. Mr. Yu loved reciting poetry throughout his life. He compiled hundreds of poems written before and after the founding of the PRC into eight small volumes titled *Yu'an Shicao* (Poetry Drafts of the Ignorant Studio) (self-printed edition), distributing them to relatives, friends, colleagues, and students.
Having engaged in TCM teaching for over 30 years, his students were spread across the nation. Among them, figures such as He Ren, Yan Dexin, Xue Meng, Cao Xiangping, Yuan Zhengang, Pei Shen, Pang Panchi, Dong Ping, Zhang Hongxiang, and Wu Junyu became famous doctors with widespread influence. His sons, Yu Qing'ao and Yu Ying'ao, and his daughters, Yu Zhujun and Yu Huijun, also inherited his profession.