Abstract: From the start of dynamic characteristics of on-line analysis of mine ventilation safety, the basic data bias and on-line analysis accuracy problems of online analysis was proposed in this paper. Firstly, the problem of deviation of daily ventilation basic data was analyzed and the main influencing factors and characteristics of data deviation of ventilation basic data were pointed out. Based on the analysis of resistance data, the accuracy of ventilation safety analysis was proposed and the analysis accuracy was divided into static accuracy and dynamic accuracy. The analysis proposed that the measurement of ventilation resistance can ensure the static accuracy of ventilation safety analysis. The dynamic accuracy assurance of ventilation safety analysis was based on dynamic monitoring of data dimension and accuracy. The data dimensions included time dimension and spatial dimension.