Originally, during the Han Dynasty, the feudal government used carriages and horses to transport scholars who were recruited. Later, people used "bus" as a code for recruiting people to Beijing to take the exam. In the spring of 1895, Kang Youwei, Liang Qichao and people from various provinces gathered in Beijing to participate in the joint examination. During this period, news came that the Treaty of Shimonoseki had been signed, which shocked the people. People from all provinces petitioned the Metropolitan Procuratorate one after another to oppose the signing. Kang Youwei seized this opportunity and immediately drafted a letter in the dialect of the Emperor. With the signatures of more than 1,300 people from the eighteen provinces who held the joint examination in Beijing, Kang Youwei put forward three propositions: refusing to sign the peace treaty, moving the capital to resist the war, and reforming to become stronger. He requested the Metropolitan Procuratorate to submit the letter to the emperor. Presented to Emperor Guangxu, but was rejected. This is the famous "letter on the bus" in modern Chinese history; although "letter on the bus" was unsuccessful, Kang Youwei, Liang Houchao and others printed it nationwide, which attracted widespread attention from people from all walks of life and promoted the development of the reform movement.