Abstract: Based on the vertical continuous waveform data recorded by Tengchong Volcano Network from October 2019 to April 2020, the noise power spectral density (PSD) and probability density function (PDF) were calculated, and the influence of the new corona epidemic prevention and control measures on the background noise of Tengchong Volcano Network was analyzed from the aspects of noise power spectral density and diurnal variation characteristics. The results show that the epidemic prevention and control has significantly reduced the power spectral density of the middle and high frequency bands (1～10 Hz) of the TCG and MZT with intensive human activities, and the daily variation law has been broken due to the interruption of human activities. XHT and RHT in sparsely populated areas are less affected by human activities, and the influence of noise changes and daily variation characteristics before and after epidemic prevention and control is not obvious. The probability density function analysis shows that the distribution of noise energy in the middle and high frequency bands of stations in densely populated areas shifts to low energy, and the PDF characteristics of stations in sparsely populated areas have weak response to prevention and control measures. The research results provide a theoretical basis for the identification and correction of noise interference in Tengchong volcano monitoring and the optimal site selection of stations, and reflect the unique value of extreme public health events for earthquake monitoring research.