Flood control bags are made up of outer bags and inside bags which is made of dank material and the expansion agent inside the bags. The bag’s size can expend to more than 80-100 times to its original size and weight meets with water in two to three minutes. The products are of good characteristics of environment protection and new and high-tech: no-toxic, no odor and pollution. Its characteristics are small in size, light in weight and convenient to store and transport. Compared with the traditional sandbag can greatly reduce the bags and save more time for rescue.