Cellular automata ( CA ) was first invented by Stainslaw Ulam and John Von Neumann in the 1940s,and in the 1970s , a mathematician , Conway, invented Game of Life based on the theory of CA . In Game of Life , each cell has only two states, live or dead . Usually live cells will be given value = 1, and 0 for dead cells . The rule is that if the initial state is dead and the number of the neighboring live cells is equal to 3,then the state will turn into live at the next generation,otherwise it will remain dead. And if the initial state is live and the number of the neighboring live cells is between 1 and 4, it remains live, otherwise it will be dead.CA has been used to simulate in many fields, and we can use it to simulate the development of an urban by creating its own rules.