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According to the great significance of 3D game technology, this paper will do detailed research on main technologies of 3D. Firstly, this paper puts forward to design concept, designs the main frame of 3D game. Secondly, through researching collision detection technologies, the improved collision detection method is proposed based on Aligned Axis Bounding Box according to some disadvantages of collision detection methods. The improved collision detection method effectively reduces operation time, advanced game speed. Thirdly, through researching artificial intelligence for 3D game, path search method is improved according to the needs of system. The improved idea uses restricting search range of A* search arithmetic with the shortest path. It can get intelligent path search efficiently and factually. Finally, the 3D game system is realized based on 3D engine technologies. The system is rendered smoothly, authentically, manipulated easily.