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The influence of the number and spatial layout of charge on the overpressure was studied using numerical simulation. The 2-D axisymmetric models were established, considering that the pressure-time history of two equal-intensity shock waves is equivalent to that of shock waves reflected from a rigid surface. At the same position, the overpressures produced by single charge and double charges, which were installed with different included angles, were measured respectively. The results show that the overpressure produced by double charges increase significantly compared to that produced by single charge. With the increase of the included angle between double charges, the overpressure increases and reaches the maximum value when the included angle is 180°.