Abstract: The top-level design of micro turbine jet-engine is presented in the paper.Firstly,the relationship between dimensions and performance of micro turbine engine is analysed.Results show that micro turbine engines have potential larger ratio of thrust to weight than conventional engines.A preliminary design of a micro turbine engine is illustrated on the basis of the related technologies that can be achieved recently.Parametric analysis of performance,such as:thrust,specific fuel consumption,energy efficiency,exhaust gas temperature,was performed by changing one or two of 7 variables.In order to assess if the design of the micro turbine engine is capable of generating the reguired thrust when put into practice,a convenient criterion is formulated,and three designs of micro turbine engine are obtained for high,moderate and low performance.