In the Zuo Commentary, the dreams have the special meaning for the people. It becomes the prediction of death or action of rule by the people. We can find that when the dreams were spoken, it will be the object that can explain. In the process of explain, dreamer and translator follow the rule of culture、tradition or convention to explain the dreams. All explanation is according to understanding of people. All meaning is also from the understanding. In the same way, the explanation is based on the understanding. So, we can conscious that the meaning of dreams will be explanation from the understanding by people. The dreams moreover always have the omen, and the omen always will be come true. It signifies that the meaning of the dreams will be explained. At the same time, it is also an annotation for history by the author.