The integral pin-fin tube is a new type of non-continuous finned tubes, increasing the effective heat transfer area, while its non-continuous fin structure can strongly stimulate the fluid boundary layer separation, to achieve enhanced heat transfer effect. Using fluent software three-dimensional numerical simulation on integral pin-fin tube is got. The results is accord to the actual situation, verifies the fluent software on integral pin-fin tube complex numerical simulation method is feasible, wile for the pin-fin tube heat exchanger simulation study provides some reference.