The world improve obviously than the past, but the problems hide in the improvement are the pollutions. The most dangerous pollution is water pollution. Water pollution is the leading worldwide cause of deaths and diseases. Earth is covering by the water, but the water can use in the life is less than one percentage. This data shows us how the water is valuable for our lives. In addition, the water pollution causes more than 14000 people died. No matter is the developing countries or developed countries, both of them still have the water pollution problem. The world economic needs the heavy industry to support,but the heavy industry is the major reason might produce many kinds of pollution. In the future, the water will become the cause of the war. If people still don’t care about the water, the water will become more important to the world and the war for the water also come closer for the whole