With the rapid development of detection technology and guidance technology, it has become an urgent need for modern electromagnetic warfare to promote the competition of weapons and equipment among countries, develop stealth technology, and improve the survival, air defense and deep strike capabilities of weapon systems. How to realize the stealth of radar wave has aroused the high attention of all countries; In the civil field, with the rapid development of 5G, the operating frequency of electronic equipment is becoming higher and higher, and the electromagnetic interference inside the equipment is becoming more and more serious, and the effect of the patch absorbing material in solving the electromagnetic interference inside the cavity has been paid attention to. However, it is difficult to attach absorbing material to complex shape workpieces. In view of this, our company has developed a frequency adjustable magnetic dielectric wave absorbing coating to solve the problem of electromagnetic interference inside the cavity.