Ching-Yuen Hsiao, 84, a former director of the National Highway Administration in the Republic of China who received the Medal of Freedom from president Harry S Truman for his work in World War II, died of cancer Dec. 18 at his home in Silver Spring.

Dr. Hsiao came to Washington in 1949 as the representative of the Chinese Ministry of Communications. He held that post until he retired in 1969. From 1947 to 1949, he had worked for his government in Canada.

Dr. Hsiao was born in Kweichow, China. He first came to the United States as a student. He graduated from the California Institute of Technology and earned master's and doctoral degrees in civil engineering at Harvard University. He then returned home and in time was named head of the National Highway Administration. He remained in China until 1947.

In the Washington area, Dr. Hsiao was a member of the Silver Spring Presbyterian Church and was active in the Holiday Park Senior Citizens Center.

Survivors include his wife, Helen, of Silver Spring; three sons, Dr. Henry Hsiao of Chapel Hill, N.C., Allen, of Monson, Mass., and Steven, of Baltimore; five daughters, Susan, of Silver Spring, Ann Hsiao-Keen of Takoma Park, Dr. Dorothy Hsiao of Bethesda, Esther Wu of Ithaca, N.Y, and Joyce, of Alameda, Calif., and 18 grandchildren.