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The existence of the cruise as a special guest room, room fire cruise with a sudden, not easy to control, great harm, to control the hidden dangers of the most effective method is accurate, timely and to detect the fire alarm, will put out the fire in infancy, not entirely to the flame growth opportunities. Accurate and timely detect the fire alarm device is a cruise ship passenger. This paper introduces a kind of based on single chip microcomputer automatic detection can timely and accurately cruise rooms and fire alarm circuit. The circuit design mainly includes the main control module, temperature measurement module, smoke detection module, display module and alarm module design. When the temperature and smoke density at the same time more than the limit value when the system will send out the alarm signal of sound and light. The circuit performance is stable and reliable, which can realize the temperature, smoke concentration appeared in real time and automatic alarm function, and use the Kill software programming and Proteus simulation software.