Aimed at the operation of sluice project the run security accidents will result in the giant loss of lives and property .In order to set up a warning system of security,the paper took the gate instability risk for example and analyzed gate instability accident,and got the index grade of warning system so as to classify early warning work.Then it also proposed the method of indicator observation and early warning indicator index rating were for the classified early warning. The Result can provide a theoretical basis for water management units to do warning work for the risk of safe operation of sluice project.