In this talk,I will touch two issues of multiscale coupling methods for solids.One is the so-called ghost force problem,in particular,I will explain its influence for dynamical problem.Another issue is a simple trick to remove the ghost force,and we study a force-based hybrid method that couples atomistic model with Cauchy-Born elasticity model.We show the proposed scheme converges to the solution of the atomistic model with second order accuracy.Some numerical examples will also be reported.