Abstract: With the application of the notch technique, the radial sensitive regions for the tightly bound system ¹⁶O+²⁰⁸Pb, and weakly bound system ⁹Be+²⁰⁸Pb were investigated. It is the first time that the shape and resonant scattering can be identified from the sensitivity functions. Moreover, strong energy dependence of sensitive regions were found for both the tightly and stable weakly bound systems: in the above barrier region, the sensitive region varies around the strong absorption radius; while below the barrier, the behavior of sensitive region is close to that of the closest approach in the Coulomb field.