Oxford Tree Graded Reading is a very popular set of English enlightenment books, published by Oxford University Press. This set of reading materials * * * has a level of 16, from 1 to 16, covering the cultivation of reading skills from letters and words to sentences and chapters.

In order to determine the hierarchical reading order of the Oxford tree, the following aspects should be considered:

1. Children's age and English level: The difficulty of graded reading of Oxford Tree is gradually increasing, so it is very important to choose books suitable for children's age and English level. Generally speaking, parents can choose books of corresponding level to read according to their children's English level.

2. Children's hobbies: In addition to considering children's English level and age, parents should also consider their hobbies. If children are interested in a topic, it will be easier to stimulate children's reading interest by choosing books on related topics.

3. Parental companionship and guidance: Parental companionship and guidance are also very important in the process of children reading the Oxford tree. Parents can discuss the contents of the book with their children to help them understand the story and improve their reading ability.

In short, to determine the order of graded reading of Oxford Tree, it is necessary to comprehensively consider children's age, English level, hobbies and parents' companionship and guidance. Only in this way can we better help children improve their English reading ability.