In the long-term bench blasting practice of open pit mining, it is found that the primary reason for toe left in blasting operations is due to the excessive small burden of the first row of holes. Based on the several fundamental propositions, the pushing wall hypothesis is put forward for the blasting mechanism and the new blasting technology using denser holes of first row is proposed based on this fundamental theory. According to the pushing wall hypothesis, the thorough connection of two neighboring holes is the result of pushing a wall toward the free face by the combined force of blasting of the charges inside these two holes under the conditions that the rock wall should have a proper thickness and homogeneity and provide enough compensation space and perform even exertion of the blasting force. For millisecond blasting in a large area, the thick rock wall is divided into several thin rock walls which are pushed down respectively. Therefore, the result of millisecond squeezed blasting is not as good as the blasting with retreated and densed the holes of first row. It is pointed out that a triangular hole layout and inter-row igniting blasting should be adopted with the densed the hole of first row blasting technology so as to reach the result of joined pushing.