Aiming at improving the limitation of adjustment and interaction by using the traditional geometric modeling methods

this paper addressed the physically-based method and FDM（force density method) for surface modeling. By building the linear constrained functions of minimal external forces and the changes of free nodes

our system thus adaptively drove B-spline surface deformation. We proposed the genetic solution to kinds of geometric constraints. Moreover

we put forward the intuitive approach to local and global deformation by interactively sketching targets and limiting curves. A series of experiments finally proved the efficiency of this method.