With the construction of the digital fairway of the Yangtze River,the electronic channel chart of the Yangtze River is to be applied formally,and it raises new demands on the ship-shore wireless communication of the whole fairway of the Yangtze River.This paper carries out a field test on the 3G wireless network of two operators:China Mobile and China Unicom,and conducts a contrastive analysis on the signal coverage.On the basis of the study mentioned above,this paper offers a technical proposal on the improvement of the communication security of the Yangtze River fairway.