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Based on the lightning disasters from 2007 to 2009， making use of MICAPS data， an analysis is made of nine lightning disasters occurred in the three years. The results indicate that all lightning disasters were produced under the background of a largescale deep low system. In seven of the lightning events， there was a trumpetshaped pattern on the 〖WTBX〗T〖WTBZ〗ln〖WTBX〗p〖WTBZ〗 chart or inversion temperature pattern or lower SI （less than 2）， and the physical elements， as vertical ascending velocity， is consistent with the 〖WTBX〗T〖WTBZ〗ln〖WTBX〗p〖WTBZ〗 chart or SI. The other two lightning disasters occurred under the background of severe rainfall in stable weather situation. The probability of inducing disasters for lightning is higher in the low humidity months.