In the history of the Yellow River in Ningxia, there had been floodplain and even flooded fields, which brought about serious losses. Most of these disasters occurred in the process of freezing and melting, and the ice floe density is one of the important indicators. Based on the meteorological and hydrological data of the Ningxia section of the Yellow River in Ningxia from 2008 to 2015, the paper carries out the simulation of the ice floe density and the meteorological elements 3 to 7 days before the ice floe occurred by means of the multiple/linear regression methods. The results show that the model is reliable, and the meteorological elements can be used to calculate the ice floe density. It is possible to make the ice floe density prediction of Yellow River based on numerical weather prediction.