The invention relates to a pesticides composition, concretely relating to the application of the pesticides composition which contains fipronil content, has synergism effect and is used to control the pests of diamond-back moth etc., on the crop. The active ingredient A in the composition is the fipronil, and the active ingredient B in the composition comprises at least one germicide of diflubenzuron and tebufenozide. Fipronil A and B comprise at least one germicide of the diflubenzuron and the tebufenozide. The weight portion ration of the two active ingredients in the composition is 1-80:70-1. The invention has obvious synergism effect, small pesticide resistance, light environmental pollution, low production cost, good control efficiency and comparatively long persistently effective period. In the control process of common pest mites of cabbage caterpillar, diamond-back moth, beet noctuid, cotton noctuid, whitefly, etc., on vegetable, fruit trees, cotton and so on, the pesticides composition combined by the fipronil which has strong damaging effect with the diflubenzuron or the tebufenozide is characterized in high efficiency, low pollution, low residue, and that pesticide resistance is not easy to be generated in long-term usage and so on.