The structure/stress and fluids are two fundamental factors that play a very important role in various geological processes. The structure or tectonism is closely related to fluids. There are many kinds of structure-fluid interactions in nature, among which the pressure solution, the fluid-induced cracking, and the crack closing are the most important ones during the geological processes. The present paper deals with the development mechanisms and the geological implications of the above three structure-fluid interactions. It is pointed out that the study of the structure-fluid interaction and its geological effects can provide useful "fossil" data for us geologists to reconstruct and understand the geological history and geological processes.