The origin of historical chronology is to facilitate scholars' research on history, and it is hereby used as a recording tool to record major events in historical years. If there are words on it that can prove its exact age, such as production year number and dynasty number, then it can be said that this is a time ruler. Through such artifacts or documents, cultural relics or documents with the same or similar styles, patterns and specifications can be attributed to basically the same era.

Method for make time scale

Take a certain period of time as the scale, for example, 50 years is represented by 1 cm, then all the major events in history are marked on it. Steps of drawing time scale: step one, determine the start and end time according to the time characteristics. Step 2: Choose an appropriate time scale. The third step is to mark the historical time and events. In this way, it acts like a ruler and brings great convenience to the future archaeological work of cultural relics.