Abstract: Sound intensity, an essential acoustical parameter indicating the direction of sound energy flow, is increasingly significant in acoustics, especially for sound power measurement and noise source identification. The two-microphone method is the prevalent technique for sound intensity measurement. This method, being approximate, inherently contains systematic errors and limits the frequency range for accurate measurement. Additionally, phase mismatch in microphone pairs is a critical factor affecting measurement accuracy. This paper focuses on accurately measuring the phase mismatch between two microphones, a key aspect of microphone pairing. Utilizing the coupler comparison method and electrostatic actuator method, the study achieves normalized and quantitative measurement of microphone phase mismatch. The research contributes to refining microphone pairing accuracy and enhancing sound intensity measurement reliability.