Abstract: On summary of classic model of trade area,this paper pointes out the differences between urban trade areas and retail trade areas.A remodified model from “inversely proportional to the square of the distance” in Huff modified model is put forward,that is,the distance between the customers and trade areas multiply the distance between the trade area and city’s commercial center.This remodified model has a strong explanatory power.

Key words: Huff modified model, location of urban trade areas