We study the boundary string field thoery(BSFT) actions by using an analytic continuation in momentum space. We compute various two- and three- point functions for some low-lying excitations including massive states on BPS/non-BPS D-branes. Though inclusion of the massive modes has been thought difficult because of the non-renormalizability in string sigma models, we overcome this by adopting general off-shell momenta and the analytic continuation. We also discuss the c=1 matrix model using the BSFT.