In order to further improve the heat transfer efficiency of flat plate micro hearts, the effects of airflow channels of different beam structures on gas flow characteristics and heat transfer performance of flat plate micro heat pipes are compared and studied by simulation and experimental research. In the simulation software, the gas flow through the four structures at a time of 50 Pa at the inlet pressure of the airflow channel is 7. 451 6, 21. 915 3, 19. 239 2 and 23. 192 8 m 3 , respectively. The experimental working medium is Methanol, the liquid filling rate is 80% ~ 100%, and the heat input is 0. 5~ 2 W. Experimental results show that the airflow channel of the arc structure is more conducive to reducing the thermal resistance of the plate micro heat and improving the heat transfer capacity. At a filling rate of 100%, the thermal resistance of RSC-FMHP, RMC-FMHP, CSC-FMHP, and CMC-FMHP is 10. 137 5, 9. 125, 9. 575, and 8. 887 5 ℃ / W, respectively. Compared with the thermal resistance of RSC-FMHP, RMC-FMHP, and CSC-FMHP, the thermal resistance of CMC-FMHP decreased by 1. 25, 0. 237 5 and 0. 687 5 ℃ / W, respectively.