Abstract: We point out that, by making use of Darboux trans formation, the analytical form of one-and two-soliton solutions of KdV equation not only can be obtained concisely,but also the properties of any soliton solutions of KdV equation can be discussed easily.Through the detailed discussion of three-soliton solution and the analytical analysis of multisoliton solutions of KdV equation, we obtain some general and interesting conclusions about properties for all soliton solutions of KdV equation. The conclusions would play an important role in the deep understanding of the law for interaction between solitons.

Key words: Darboux transformation, KdV equation, Soliton solutions