Concerning to the problem that the continuity of freezing disaster has not been considered when evaluating distribution system power supply reliability, a new distribution reliability evaluation method considering the continuity of meteorological parameters is proposed. Firstly, the term “meteorological load” is defined to describe the influence of freezing disaster on the distribution system with the conventional meteorological parameters which are easily measured. Secondly, considering the quality distribution of system components and then combining them with design standard of line, the model deducts the relationship between the components reliability and the meteorological load based on the statistical data. The line fault probability model is established considering different design criteria in freezing disaster. Thirdly, the meteorological parameters variation is simulated and the meteorological load variation that the distribution system of bus 2 in RT-ETST bears is analyzed based on MATLAB simulation platform. The power supply reliability of every load point is evaluated.