There are no detailed design criteria and methods for the Integrated design of micro turbojet engine. In this paper, a integrateddesign method and evaluation of 9kg ~ 80kg micro turbojet enginesare carried out by using the size and weight design method. The intergated design parameters database of micro turbojet engine is established, and the intergrated design criteria of micro turbojet engine is extracted. Using this criterion, the Integrated design of 16KG micro turbojet engine is completed. The results show that: using the intergrated design method for the micro turbojet engine, the obtained design criteria are highly reliable, and the overall scheme design of the micro turbojet engine can be carried out.