Digital Mine has become the inevitable development trend of the future mines. Blasting is a essential process during the exploration and development of practical mining engineering. The blasting always plays a direct influence on the efficiency of each follow-up production process and if it were not handled correctly, it will even threaten the safety of miners. This paper presents a novel cross-platform tunnel blast design system used in Digital Mine to simulate the blasting process automatically, which shows how to construct the system modeling, design the blasting parameters, generate 3D holes pattern 3D blasting animation and parameters report. In order to generate blasting process, setting and calculating the parameters of inputs and outputs are grounded on the theory of minimum burden and experiences in blasting engineering, which tunnel smooth blasting is represented as an example in the paper. Results show that our system can reduce the time consuming of traditional manual blasting design and the most important is that our system does not rely much on the experiences of engineer. The experiments show that the results of our system are efficient, reasonable, and this system can be applied and referred in the production and research of tunnel blasting in Digital Mine.