Abstract: This paper introduces a variety of temperature effects on concrete dam operation by studying some cases. Those effects can result in dam cracks,cracks under construction enlarged and dam surface destroyed by freeze-thaw,deep concrete destroyed by frost heave. It not only influenced dam operation age, but also menaced dam safety operation. If we have carried out controlling dam temperatures at its operation (included blocking dam gallery and holes, water-logging at ogee spillway) to reduce temperature change range,thereby improving dam body stress condition and decreasing the range and degree of freeze-thaw and frost heave.