Boundary element method is applied to calculation of the electric field intensity caused by the thunder-clouds. The field is calculated from the source or cloud charge under the given boundary condition, and the pound surface where the electric potential is equal to zero is chosen to be the boundary. The boundary expands to infinite area, therefore a special device, or a new type semi-infinite boundary element, is used for the effective field calculation. To examine the validity of the approach, some numerical calculations are carried out for the problem in which the exact solution is known. It is found that the approach is more effective compared with the conventinal method. The numerical simulations using the topographic data in Hokuriku area are also shown.
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