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Three kinds of Enhanced Boiling Microstructures(EBMS) were fabricated. A series of pool boiling experiments were carried out to estimate the performance of all kinds of EBMS. According to the results of pool boiling experiments, the best EBMS, which have the lowest wall superheat and highest Critical Heat Flux (CHF), was chosen as the most important part of a new designed Two-phase Closed Loop Thermosyphons(TCLT). The aim of the TCLT is to dissipate high heat flux of some electronic devices. The TCLT was composed of an evaporator, a condenser, a subcooler and connecting tubes. A series of dissipating heat experiments of the TCLT were carried out. Results show that thermal resistance of the TCLT can reach minimum value 0.077°C/W, and the highest heat flux that the TCLT can transfer is 44.2W/cm2 when pure water is the working fluid.