This paper deals with the experimental findings of the characteristic of deflagration-to-detonation transition in two kinds of pressed explosives—A and B. A series of tests are performed on the high-density explosives. Electrical pins and pressure sensors are used to measure the pressures and velocities of shock, flame, or detonation wave. The experimental results show that it's very difficult to obtain the transition in the pressed explosives. The phenomenon of low velocity detonation (LVD) is achieved under the confinement condition that the length of DDT tube is 400 mm. A deflagration-to-detonation transition in the pressed explosives of A is obtained under the stronger confinement condition that the length of DDT tube is 600 mm and the detonation-induced distance is slightly longer than 545 mm. It's also concluded that the pressed explosive of A is more sensitive to transit into detonation than the pressed explosive of B under the same experimental conditions.