The NB-IoT (Narrow Band Internet of Things) network is proved be suitable for connecting everything with low energy consumption, high concurrency at a low cost. In this paper, we proposed a NB-IoT based smart lamp scheme to solve the problems of traditional street lamps, such as large electricity consumption, difficult maintenance and inconvenient management. Random access, staggered peak communication and reasonable heartbeat mechanism are proposed to improve the soft capacity of the system. The commercial project shows solution we proposed can effectively manage every single lamp. The online rate and the communication success rate are all up to expectations.