According to the construction of water Wells, divided into different objects (water and water Wells) injection Wells) profile (2. Its purpose is to remedy the situation well cementing technique and reduce water flooded layer of permeability (adjust flow profile), improve the recovery of reservoir.  Plugging agent usually refers to the treatment for production Wells of water, and profile control agent is used to adjust injection profile of water treatment. In the field of water by chemical and mechanical modification method is divided into two categories, chemical water plugging agent of chemical modification of the water chemistry caused by the Massachusetts, mechanical method in water is a water separators will open in wellborne card, to prevent water into the shaft. Currently, the development and application of main chemical modification. According to the wall of oil and water layer, chemical modification of congestion function can be divided into the selectivity of water and water fell sex, According to the construction requirements and permanent and temporary plugging and wall.The selective water plugging agent refers to the oil reservoir can also block in the water and chemicals, Selective modification refers only to water plugging agent, but not with oil, it is only in the water and oil plug caused tower has little effect. Water shutoff profile control agent technology in oilfield application for success, produce benefit, in addition to have good plugging agent, must also be thorough research and treatment technology, reservoir axiomatization, cooperate with each other.