This paper bases on the research of cellular automaton and Agent, proposing a Grid-Agent model. This model uses the grid as the basic unit, and the individual Agents in the grid implement their movement by judging the state of their own and the grid around to achieve the purpose of simulating the crowd behavior. This will overcome the insufficient of the cellular automaton by simulating the crowed behavior, and also overcome shortcomings that the lack of temporal logic the Agent-based. At last, this paper simulates the crowd-gathered behavior by using the model, and the results show that the Grid-Agent model is more accurate and logic in the simulation of human behavior, and we can observe and research the regulation of crowd-gathered behavior better.