Abstract. A practical rainfall generator for meteorological metrology research has been designed. The rainfall generator is adopted to produce a rainfall environment for rainfall instruments test and calibration. The uniformity of the rainfall generator is tested with rainfall collectors and the Christiansen coefficient of Uniformity (CUC) ranged from 80.57% to 87.32%. The results obtained by the rainfall generator indicate that the middle part of the whole test plot is consistent and raingauges can be planted in the four quarters of the compass so as to carry out rainfall intensity test.