Aiming at problems of traditional hospital environmental monitoring system

which are difficulty of addressing

poor mobility and measurement precision is not high

present a new hospital environmental monitoring system based on wireless sensor networks（ WSNs）

and introduce system structure

communication mechanism and flow chart of program in detail. Wireless sensor nodes form WSNs based on wireless communication mechanism. On the basis of analysis on main factors that influences energy consumption of WSNs and the existing energy-saving technology

propose a reliable data transmission algorithm

dynamic power management clustering algorithm（ DPMCA）

which is based on energy balance

it effectivly combines dynamic power consumption management technology with clustering algorithm. This system solves effectively problems in hospital environmental monitoring.