To solve the problem that the present of large group performance is usually inconsistent with the expected, we used large-scale crowed simulation technology to simulate performances of actors, and used level of detail rendering, image-based rendering, pre-rendering lighting, and geometry instancing to make an efficient rendering of the performance. As an application we implemented a digital performance simulation system which was developed based on Virtools. The system simulated the whole process large group performance, and the results of creativity could be intuitive understood by creative designer in the initial time. Experimental results show that the digital performance simulation system could provide convenience for creative designer to make creativity scheduling and preview, effects of creativity, and it makes the arts creativity be showed perfectly in large group performance possible.