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The flow field in the cooled channel of a heat exchanger was measured using the X-type film probes of Hot Wire/Firm Anemotheter, and the turbulent mechanism was discussed. It is concluded that the airflow is cooled in the flow process, the distribution of the turbulent intensity is relatively convergent near the centerline and the boundary, the constriction action produced due to heat release at the foot of the fins causes u to decrease and w to increase near the root downstream. It is concluded that the turbulent flow with cooled boundary results from the balance of production, dissipation and intermittency caused by constriction action.