On the purpose of optimizing plybamboo formwork supporting system, saving the construction cost of plybamboo formwork, according to characteristics of plybamboo formwork supporting system, plybamboo formwork system optimal model is put forward in combination with optimization theory, which could reasonably calculate the space of stringers, joists and shores, in order to reach the aim of meeting the requirement of saving construction cost under the condition of bearing capacity. Optimization result shows that the traditional design method is more conservative, it ignores the influence of floor size on support system. The optimization model that built in this paper could select the type of support and design the space of support reasonably, so that the construction cost could be saved. The optimization design software is developed to make the complex design optimal process become easy to operate, greatly improving the efficiency of the designers’ work, and combined with BIM technology,which has the advantages of 3D visualization and simulation of construction, to solve the problem of complex design drawings and design clarifying difficultly, finally realize the integration of formwork design, construction and management.