The signal of checkweigher is affected by vibrations rising from the mechanical transmision systems, the measured object itselfand other random interferences. As a result, the signal-to-noise ratio of the sensor output is exeeptionally low, and the weighing resultsare dificult to meet the requirements of the national standards. To solve these prohlems, this paper combines the advantages of time-variant low-pass fiter and morphological filter, and proposes a novel fast data proceessing method. The time-variant low-pass fiter is usedfor one-stage filtering. The fiter parameters are optimized and adjusted iteratively when the signal changes, so that the edge signal canrespond quickly, the impact interference can be eliminated effeetively and the phase distortion of the weighing signal in the fiteringprocess can be suppressed. Then, an improved morphological filter is used to conduct the secondary filtering. By selecting zero-valuelinear structural elements, and opimizing the length of struetural elements and the weight eoefficient of the operator, the response speedof dynamie weighing is acceleratedl. Experimental results show that the proposed method can effectively suppress various interferences andimprove the weighing accuracy, Finally, a checkweigher system is constructed in this paper, which can achieve a maximum operatingspeed of 120 m/min and a maximum weighing of 400.0 g. It meets the requirements of the national standard“GB/T 27739-2011Automatie Catchweighing Instruments" category XIII Scale.