To identify the wilted plant morphology, based on the 3-D images obtained from a laser-scanner, four types of wilt-index were defined, including statistical index of wilt-induced leaf (SIWL), Gaussian curvature at the physical center of leave, projecting distance from leaf-tip or leaf-edge to a referenced plane being tangent at the physical center of leaf. For the experimental methodology, the wilted-leaf statuses were divided into five levels, which were used for verifying whether each defined index had monotone property from earlier to serious degree of wilt status. The experimental results demonstrated that the indices in terms of the projecting distance method could meet the requirement for this purpose. In particular, the index relating the leaf-edge to the referenced plane could provide more robust results. 