To meet the need of water level measuring and monitoring system in coalmine

an intelligent water level measuring and monitoring system is developed based on wireless sensor networks（WSNs）

using intelligent water level sensor and microcontroller PIC.The hardware and the software of the system are introduced

and the test results are given.There are many functions of this system

such as measurement

display

alarm and communication.Based on WSNs’protocol

it surmounts defect of wired sensor networks and avoids the high-energy cost of other wireless technology.Experiments show that the system is of high accuracy

high reliability and low power-consume

it can realize detection and monitoring of mining water level effectively.