1. "Personal background" of reading materials: Each publishing house has different emphases, so you should be familiar with each publishing house. For example, higher education publishing houses are more oriented to universities and adults, while foreign language teaching research publishing houses are more authoritative and professional in the foreign language and children's publishing industry.

2. Is the reading content graded? In reading, especially in foreign language reading, it must be graded, because from the perspective of a foreign language, there are differences in language difficulty and law. If there is no grading, it may make children's learning a bit confusing. Grading helps to cooperate with children's classroom learning.

3. Is the content balanced? The first important balance is the balance between education and literature. China's publishing houses tend to choose something more educational and moral.

4. Flexibility in the form of reading materials: fun and curiosity are children's nature, so when a book looks satisfactory, it is difficult to attract children. Children's books may have to consider the proportional relationship between words and pictures more formally.