Before Western-style schools emerge in China, San Zi Jing (三字經) and You Xue Qiong Lin (幼學瓊林) are the main primers for children to learn common sense. San Zi Jing is a small encyclopedia of common sense, and You Xue Qiong Lin is a lexicon of idioms and allusions. We notice that there is a lot of general knowledge of natural science and technology in these two books. The ancient educators do not neglect the subjects of natural history, natural science and technology.