She did premedical work at the Union Women's College of North China (Yenching University) in 1910-1912. Then she graduated from the Union Medical College for Women of North China in 1917. She did post-graduate study at Johns Hopkins in U.S.A. and in Europe in 1925-1927.
Marion Yang worked at Porter Hospital for Women in Tehchow, Shantung in 1917-1921, Isabella Fisher Hospital in Tientsin, China in 1921-1922, Department of Obstetrics and Gynecology, Peking Union Medical College in Peiping, China in 1922-1926.
She was a Chief of the Division of Medical Services in Health Station, Special Health Area, Peiping and Instructor in the Department of Hygiene and Public Health, Peking Union Medical College in 1927-1930. Then she was appointed Technical Expert, Ministry of Health in 1930, Technical Expert of Central Field Health Station, National Economic Council, and concurrently Chief of Department of Maternity and Child Health in 1933.
Ms. Yang was a member of the National Midwifery Board, Director of the newly established First National Midwifery School at Peiping and Director of the Child Health Institute (a co-operating institution) since 1930, concurrently Honorary Lecturer in the Department of Public Health.
Marion Yang was an author of a number of medical papers on maternity and child health.