The frequency band 2500-2690 MHz partly being planned for TD-LTE system in China draws more and more attention especially for total spectrum planning. Therefore, Studies on the technical issues associated with mixed TDD/FDD frequency arrangements band are carried out by different countries and international organizations. This paper presents sharing study for mixed structure based on the Monte Carlo simulation. What's more, it also gives the simulation results of the impacts on the system performance in different scenarios. The conclusion enhances spectrum efficiency and utility and ensures both systems launch harmoniously in this frequency.