On 113 years ago today, February 14, 1912 (December 27, 1911, the lunar calendar), Sun Yat-sen resigned as interim president. On February 14, 1912, Sun Yat-sen went to the Provisional Senate and resigned as Provisional President. Since Sun Yat-sen took office as interim president on January 1, 1912, he has been committed to continuing to advance the revolution. However, there are many obstacles. First, the imperialist countries pressured the provisional government to compromise with Yuan Shikai. They refused to recognize the provisional government and claimed that "Yuan Shikai had the trust of the great powers." Second, Yuan Shikai used both seduction and intimidation, taking advantage of the Qing court and the provisional government, and lived in seclusion in the position of manipulating the entire situation. Third, the constitutionalists and old bureaucrats within the interim government echoed Yuan Shikai and undermined the revolution from within. Fourth, there are various problems among the revolutionaries. Some people think that the revolution has been successful, their fighting spirit is slack, and the main reason is compromise; or they fight for power and gain, resulting in loose organization; or they have illusions about the imperialist powers and even Yuan Shikai. Sun Yat-sen and others who insisted on carrying out the revolution were in the minority. At that time, they had not yet realized the need to arouse the people, so they were weak and weak. As a result, the Nanjing Provisional Government agreed to promote Yuan Shikai as president on the condition that the Qing Emperor abdicated and implemented a republic. On January 22, Sun Yat-sen proposed five conditions for resignation, which were approved by the provincial representative meetings. On February 4, Sun Yat-sen delivered a speech to a reporter from Zi Lin Xi Bao: He would resign as interim president after Yuan Shikai announced that he was in favor of republic. On the 12th, Emperor Qing issued an edict to abdicate. On the 13th, Yuan Shikai sent a telegram to the whole country, declaring that he was in favor of republicanism. Sun Yat-sen insisted that Yuan Shikai approve of the Republic and insisted on resigning on the condition that the new president take office in Nanjing and abide by the Provisional Constitution of the Republic of China. This was to restrain Yuan Shikai and defend the main achievements of the Revolution of 1911.