In this paper, statistical models for growing rate, yield and yield percentage prior to frost arrival were established and verified for film-covered cotton crop based on the five-year staging-sowing experiment from 1991 to 1995. Concerned agrometeorological indices were also derived and examined against the real data. Taking climatic data and grid interpolated one in every place of Ningxia from 1961 to 1990 as inputs to the models, growing process of the cotton, yield and yield percentage prior to frost arrival were modelled and their probability distributions were computed and drawn. Finally, the preference degree of planting film-covered cotton was analyzed and regionalized in the Ningxia.