Taking Luochengzhou protection engineering in the straight reach of the Yangtze River as an example, this paper probes into the reasons for the tearing of soft mattress of concrete interlocking blocks during construction based on the analysis of the construction condition and the check of the longitudinal tensile strength, and according to the course and phenomenon of tearing, investigates the treatment ideas and methods, and recommends the method for increasing horizontally-moved reinforced bars.