After the war, Ritter von Greim struggled to find a place in the
Reichswehr, the 100,000-man army that the
Versailles Treaty prescribed to Germany, and was unsuccessful. As a result he decided to focus on attaining a career in law, and even succeeded in passing Germany's rigorous law exams. However, the lure of aircraft and pilots was too strong, and he was asked by
Chiang Kai-Shek's government, to come to
Canton, China to help build a Chinese air force. Ritter von Greim went with his family to China where he founded a flying school and laid some preliminary measures regarding the development of an air force. He built on these later in his career. Ritter von Greim's opinion of his Chinese pupils was not high, perhaps because of the contemporary belief among Europeans that Asians were unable to operate complicated machinery. He said in a letter that "The Chinese will never make good fliers, they have absolutely no fine touch with the stick". Even before the
Nazis came to power, von Greim realized that his proper place was not in the expatriate community in China, but in Germany, and he returned to his native country.
In
1933, Ritter von Greim was asked by
Hermann Göring to help rebuild the German Air Force and in
1934 was appointed to the command of the first fighter pilot school, following the closure of the secret flying school established near the city of
Lipetsk in the
Soviet Union during the closing days of the
Weimar Republic. (Germany had been forbidden to have an air force under the terms of the
Treaty of Versailles of
1919, so it had to train pilots in secret.)
In
1938, he assumed command of the
Luftwaffe department of research. Later, Ritter von Greim was awarded command of Jagdgeschwader 132
Richthofen (later JG 2), based in
Doeberitz, a fighter group named after
Manfred von Richthofen.