The current research about Power-MEMS is mentioned. A micro turbine-generator system which aims to generate ultra-high power density at a high speed about 105r/min is put forward. Its work-principle is adequately introduced. The performance-tests of the turbine-generator are accomplished on a test-bench which has been specially designed. It can be seen that the micro turbine-generator system is able to generate about 0.6W output-power and a maximal voltage about 12.5V. Moreover, the turbine-generator is tested in four conditions in order to investigate how the pressure, volume flow and temperature of inlet gas affect the system’s performance.