Abstract: When an elastic panel is subjected to double-side indentations by two relatively rigid, square-ended uniform punches, a singular stress field and K-dominant region would be arisen adjacent to the punch edges. The stress intensity factor for such stress fields is also a fracture parameter similar to the Mode I crack, which represents the intensification of the stress fields. In this paper, a method to formulize the SIF and critical load induced by double-side indentations is proposed based on the conservation integral. The critical condition of the boundary cracking is found. Numerical investigations had been carried out by using the proposed method and the finite element method.