The work aims to solve the problems of the huge flight cost caused to the stealth aircraft by the excessive weight of the microwave absorbing patch, the easy scratches, damage and fast material loss of the microwave absorbing patch under flight conditions and the complex repair process, long time and a large amount of maintenance costs. The TRIZ theory was applied to analyze and solve the problems. The key defects for the high cost of the microwave absorbing patch for aerospace were found by functional model analysis and causality analysis. Then, several solutions were obtained by technical contradiction analysis, physical contradiction analysis, material field model and standard solution, small man method and other tools. After comprehensive evaluation, an economical solution easy to implement was found. By TRIZ theory and comprehensive evaluation, the optimal scheme to reduce the cost of the microwave absorbing patch was found. The absorbing body of the microwave absorbing patch was composed of a porous structure of graphene doped with heteroatoms, which increased its absorbing performance. Then, the material was combined with the self-healing material to increase its self-healing ability, so as to obtain the microwave absorbing patch with good absorbing performance, small weight and strong self-healing ability. The research results have a certain theoretical significance to reduce the cost of microwave absorbing patch in stealth aircraft, which is helpful to reduce the harm to human and environment caused by highly integrated devices.