Z指数广泛应用于中国南方地区旱涝时空演变特征识别中，Z指数的计算只需要降水资料，且不受地域、时间尺度的局限，适用于多时间尺度的旱涝定量研究。文件为Z指数的MATLAB编写程序。(Z index is widely used in the spatial and temporal evolution of drought and flood in southern China. The calculation of Z index only needs precipitation data and is not limited by region and time scale. File for the Z index MATLAB preparation procedures.)