Abstract: Based on standard k-ε turbulent model in conjunction with the wall-surface function method，a three-dimensional numerical calculation of the fluid flow and heat transfer in dimple jackets was performed. A comparison of calculation results with test results showed that the error was less than 10%，indicating that the simulation model was reliable. The effects of geometrical parameters，such as cone angle，interval，height，diameter and arrangement of dimples on heat transfer performance of dimple jackets were investigated by adopting orthogonal design and factorial analysis，and structure parameters were optimized according to the response surface approach combined with variance analysis.