1. First, you need to determine which data items the data dictionary contains, as well as the name, data type and data format of each data item.

2. Then clarify the data source of each data item. For some data items, it needs to be obtained through a certain conversion method.

3. Secondly, clarify the foreign key relationship between the data dictionary and other tables.

4. Finally, fill in the sample data according to the actual situation, so as to better understand the meaning and content of the data dictionary.