Abstract:The historic conservation area of DongGuan Street with the largest scale is a commercial street which is well preserved in HanZhong City.This article firstly analyse the street pattern changes of DongGuan Street, by reading the historical literature and researching the current situation. And then,analyse the characteristic of street space form from the relation between figure-ground,the space interfaces,the space scale and the space node.Finally,put forward several suggestions about the fish-bone street space protection on the historic conservation area of DongGuan Street with the two streets and six alleys.