Based on the water level information requirement from the Yangtze River mainstream waterway maintenance and management work and the Yangtze River shipping,we study the key techniques in the perception,acquisition,transmission and integration of the water level information at the water level monitoring stations and establish the water level information monitoring system which can reflects the water level variation of the Yangtze River mainstream waterway accurately and timely,and which provides important water level information for the Yangtze River digital waterway.