There are some pain spots in fire protection, including delay of fault alarm processing, difficulty in management & maintenance of device. The development of IoT technology and commercial deployment of NB-IoT network by carrier provide new way to resolve those questions. The fire protection device and the place with fire hazard is real-time perceptible now. The article describes how to choice the IoT technology and protocol, and how to reduce the power consumption of IoT terminal equipment which uses battery.