Paul Monroe is widely recognized for his important contributions to the development of the field of international and comparative education. Monroe’s far-reaching impact on education worldwide is best exemplified by his significant influence on modern Chinese education system, which he exerted through extensive fieldwork, lectures, and charity work spanning over three decades. However, Monroe’s legacy in China has often been overshadowed by another giant of his time, John Dewey. This paper aims to re-examine published literature and primary sources and shed light on Monroe’s groundbreaking efforts to improve education in China during the 1920s. Important connections are drawn between Monroe’s comprehensive educational surveys in 1921, the subsequent 1922 national reform, and his long-term commitment in promoting science education in China.