First of all, you should have a rich and solid basic knowledge of history and have a special study on its history and important historical events, which is the premise of historical themes. Otherwise, you should choose other fields. There are five sources to obtain materials: first, history books and local chronicles. Second, collect historical events to obtain material. Third, collect historical figures. Fourthly, get the material from the study of regional culture. Five, usually accumulated. Sixth, online keyword search.