Abstract: Before the Xi’an Incident, the Chinese Communist Party and its Red Army, settling down in Northern Shaanxi, appear to be quite weak facing the military encirclement and attacks by the Koumintang, despite having some favorable factors. After the Xi’an Incident eruption, the situation of the Chinese Communist Party and its Red Army substantially improves. Although unfavorable factors exist, the overall environment has become advantageous. For quite some time after the Xi’an Incident, the Chinese Communist Party and the Red Army grow steadily, laying the foundation to claim the country. In summary, the strong development of the Chinese Communist Party and Red Army after the Xi’an Incident is the result of following and meeting the popular will.