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The grey correlation degree is a measure of relation among various factors, can be used to evaluate natural disaster loss. By using the grey correlation degree method, the disaster loss assessing indexes and correlation degrees of 19 severe weather events (strong winds and heavy rainfall) are calculated. The results show that the grey correlation method is reasonable in the grading of disaster situation and the ranking of disaster loss correlation degree, with the results basically in agreement with the actual situation, being applicable for natural disaster evaluation. It can identify the disaster lost difference among different meteorological disasters, as well as the differences among the meteorological disasters of the same class. It can be used to the operational disaster loss evaluation service.