Abstract:The deformation observation data at Wuhan station were systematically analyzed on the basis of the "Analysis Platform of the Precursor Network (Station) Observation Data Tracking." Three sets of digital deformation observation instruments, namely, the DSQ water tube tiltmeter (NS component, EW component), SSY indium rod extensometer (NS component, EW component), and VS vertical pendulum tiltmeter (NS component, EW component), were installed at Wuhan station. All three sets of instruments operated stably, and the recorded data were continuous and reliable. The observation curves of the events affected by rainfall disturbance were extracted. Moreover, the influential rainfall events were analyzed in terms of rainfall parameters, including the amount of rainfall, initial driving rainfall, and maximum value of instantaneous rainfall. Results showed that the DSQ water tube tiltmeter was subjected to rainfall disturbance when the total rainfall amount was 40 mm, the initial driving rainfall reached 0.3 mm, or the maximum value of instantaneous rainfall was 0.6 mm. The SSY indium rod extensometer was susceptible to rainfall when the total rainfall amount was 60 mm or the maximum value of instantaneous rainfall was more than 0.5 mm; no significant correlation was observed between the rainfall interference of the VS vertical pendulum tiltmeter and the rainfall parameters. The influence of rainfall amount on the observed physical quantities of the instruments was linear. However, no significant correlation was noted between the observed physical quantities of the instruments and the initial driving rainfall and maximum value of instantaneous rainfall. The influence of rainfall on the deformation observation at Wuhan station was attributed to rainfall infiltration and surrounding water load changes.