A modelling method of microburst fields based on the slanted vortex-ring model was proposed. Unlike the previous vortex-ring-based model which can only generate the vertically downward microburst fields, the proposed method can produce the slanted microburst fields which are closer to the natural conditions. By setting the slant angle and the orientation angle of the slanted vortexring model, the microburst fields with any slant angle and orientation angle can be generated. A nested DE algorithm was introduced for the selection of model parameters, through which the model parameters can be flexibly and easily determined in accordance with the experimental requirements. A series of experiments were conducted and the results indicate that the proposed method can accurately and effectively generate the microburst fields.