Abstract: Firstly，a functional surface structure with regular pores for heat transfer，namely cross-connected micro-channel mesh plate (CCMMP)，was designed and fabricated via multi-cutter milling． Secondly，three pore charac-teristic parameters，namely porosity，specific volumetric surface area and specific weight surface area，were theoretically calculated，and the effects of microchannel interval，depth and width on these three parameters were investigated． Then，CCMMPs were applied to a plate heat exchanger to analyze the pressure drop and the heat transfer performance affected by volume flow，porosity and specific volumetric surface area by experiments． The re-sults show that (1) the porosity ranges from 10． 9% to 88． 0% and the specific volumetric surface area ranges from 2．89mm^-1 to 6．40mm^-1 if the interval，depth and width of microchannels are all adjusted correctly; (2) CCMMPs quadruple the heat transfer performance; and (3) high porosity and large specific volumetric surface area are favor-able to heat transfer．

Key words: microchannel, mesh plate, porosity, heat exchanger, heat transfer, pressure drop