This study aims to enhance the compatibility of ethylene propylene diene monomer (EPDM) and silicone rubber (MVQ) based on the "principle of similar surface tension". Therefore, different types of modifiers are added to MVQ to increase its surface tension and narrow the gap with the surface tension of EPDM. Experiments show that the water contact angle of MVQ with different modifiers decreases significantly, and the interfacial thickness of the corresponding EPDM/MVQ blend increases, resulting in improved compatibility. Compared with the unmodified EPDM/MVQ blend, the mechanical properties before and after aging also increase to varying degrees.