A new optimization model of the structural topology based on the ICM method is described to apply into both skeletonal and continuum structures. The ICM meansIndependent, Continuous variables and Mapping transformation and its inverse. The model has united both structures into a uniform optimization problem with the weight objective function subjected to size constraints, stress and displacement constraints under multiple loading cases, A filter function is proposed to be one of key techniques of the ICM method. The optimization strategies and algorithms are illustrated in the paper.