Abstract: In order to control the stability of cut slope, improve rock-fragmenting result of blasting and reduce the blasting harm, the principle of multi-boundary rock cutting chamber blasting and the technology of control blasting are explored. The blasting design method must be suitable to the boundary conditions of different topography. The calculation formula of explosive quantity should directly reflect the influence of topographical boundary conditions and blasting effect. Based on the engineering practice of Miyun-Pinggu highway, such technological measures as disposing similar linear charges along the route direction, controlling charge weight per delay interval by the short-delay firing are used to reduce the blasting vibration effectively, thus ensuring the formation and stability of cut slope.