It should be in the early days of the founding of the people's Republic. At that time, the illiteracy rate in China was as high as 80%. Illiteracy became an obstacle to the development of new China, and then a literacy campaign was launched.

From 65438 to 0950, the party and the government held a national conference on workers and peasants education and decided to carry out literacy education.

1952 On May 24th, China launched a large-scale literacy campaign, which lasted until the end of 1950s.

I hope this helps.