The work is a simulation of the construction type of the game. In the game, players mainly increase the population by building houses, build shops to make profits, and build factories to produce lost materials such as shops and construction buildings. The game also contains electricity, water, happiness, public buildings and other elements. The realization of a construction of the city system. The game involves a lot of data calculation, and the interaction between buildings increases the difficulty of the game. The game also contains two design difficulties: road construction and car AI. The real-time updating in the process of highway construction, judging whether it is pressed to the building, and the automatic generation algorithm of various intersections are the difficulties of highway design. The AI complexity of cars lies in the realization of right-hand traffic, random generation of target points, avoidance of car overlap, soft turning effect, and changing the number with the change of population.