Abstract: All seats were reserved seats in the train of High-speed Railway. Due to the stochastic demand, cracking seats would cause the seat fragmentation. There were several different number of seats which could meet a long section of passenger’s demand, on the contrary, these tickets couldn’t be sold in reality, and caused the loss of income. By the way of the simulation analysis for random process of passengers booking process, the degree of fragmentation for High-speed Railway seat was analyzed. The result showed that the loss of income wasn’t great due to fragmentation, and cracking seats in order was allowed during executing revenue management.