Experimental research was conducted on the selection of radiofrequency field intensity in Mx-type radiofrequency-driven magnetic resonance magnetometer measurements. The influence of radiofrequency field intensity on the characteristics of resonance signals was investigated using a cesium atomic magnetometer system in an unmagnetized environment. Measurements were carried out using a frequency scanning method, and features such as signal amplitude, linewidth, and slope were analyzed. The results indicate that the optimal radiofrequency field intensity accounts for approximately 3.6% to 4.1% of the magnitude of the magnetic field being measured, at which point the amplitude of the signal resonance peak reaches its maximum value. Additionally, it was observed that the slope of the phase signal resonance peak varies directly with the radiofrequency field intensity, leading to the deduction that the system relaxation rate is inversely proportional to the radiofrequency field intensity. This research provides important guidance for determining suitable radiofrequency field intensities and offers innovative insights into magnetic resonance magnetometer measurements.