Historically, except the Tang Dynasty, China was very open to the outside world. Especially in the Qing Dynasty, the closed-door policy made China more and more backward. At that time, there were many missionaries in Qing Dynasty. Their arrival did improve the life of the people in the Qing Dynasty, but it also brought disaster to the people at that time.
Because of the closed door policy, the Qing Dynasty missed the world industrial revolution, so it lagged far behind the western countries in economy, culture and education. At that time, missionaries from these countries came to the Qing Dynasty and taught the people a lot of knowledge, brought advanced technology and changed people's thinking, which was helpful to the progress of the Qing Dynasty at that time. Although they were not particularly willing to help the Qing Dynasty at that time, they did change the lives of the people in the Qing Dynasty.
The biggest manifestation is in medical care. China has paid attention to medical treatment since ancient times, that is, when the disease is weak, the curative effect of traditional Chinese medicine is slow, while western medicine can get immediate results in this respect. For the backward Qing people at that time, western medicine was of great help to the Qing people and improved their health concept. But at that time, many missionaries were actually western spies. They lived in the land of the Great Qing Dynasty, and then told the people this information after returning home, which inspired their ambition to invade China. In the late Qing Dynasty, China became the target of aggression by western powers.