Taking the average gray value of the luminous port image of the navigation aid lamp as an index, several key factors affecting the cleaning effect of the navigation aid lamps are studied. The cleaning pressure, cleaning time, cleaning distance, cleaning angle, cleaning medium content and cleaning rate are blurred by using fuzzy theory. The fuzzy prediction rule base is established by orthogonal experiment. The prediction of cleaning rate was achieved under the condition of given input parameters by rule based fuzzy reasoning. The experimental results show that the prediction errors are less than 6%.