A view of the frequent occurrence of fire, this paper designed an intelligent fire alarm system to realize temperature and smoke concentration detection. The fire detectors are MQ2 smoke sensor, DHT11 temperature sensor and FIGARO TGS 813 sensor and core control is STM32F103ZET6 in this system. The fuzzy control theory is used to improve the accuracy of the system and reduce the false alarm rate. Through the wireless WiFi transmit data, and send alarm information to the mobile phone client by GSM remote communication. After the test ,the system ,with strong practical, wide range of applications, suitable for security system of smart t home.