This is because at the beginning of the 20th century, China's national strength was weak and its society was in turmoil. Faced with invasion and plunder by foreign powers, it needed powerful foreign aid to support the country's construction and development.
As a socialist country, the Soviet Union also needs to expand its influence and sphere of influence, so it is willing to provide help and support to China.
With the help of the Soviet Union, China established its own industrial system and military strength, which promoted the process of socialist construction and modernization.
However, Sino-Soviet relations gradually deteriorated in the 1960s, which eventually led to the deterioration of Sino-Soviet relations and interrupted the cooperation and exchanges between the two countries.