U-tube heat exchanger is the most widely used of a heat transfer equipment currently, as a standard heat transfer equipment. It has only one tube plateTherefore, when devices are heated or cooled,the heat exchanger tube could free telescopic. In order to increase fluid flow rate in the pipe outer space, to improve its heat transfer, Multi-block Baffled boards were installed in cylinder. This heat exchanger structure is simple,but manufacturing Curved pipe 's work is heavy. This heat exchanger can be used for temperature changes in large, high temperature or high pressure situations.