Based on the universal law of precursory fluctuation intensification before strong earthquakes,this paper takes the 1990 Gonghe strong earthquake as an example to study multi-hi-erarchy of the precursory fluctuation intensification of the small earthquake frequency,the modulation ratio of small earthquakes,radon in groundwater and hydraulic discharge in spring before the earthquake.According to the phenomenon authors considered that the multi-hierar-chy of the precursory fluctuation intensification is an important path for prediction by following the tracks of a strong earthquake.