The aim of this study is to clarify the space organization of the shophouse and the block formation in Daun Penh area, Phnom Penh, Cambodia. We analyze the space formation of the house and the housing complex on fifty-five houses, and the formation of housing lots and alleys on the thirty blocks by the field survey. We clarify three types of the shopshouse. Considering on the formation, we conclude the multi-story living in one span which can be seen on French colonial shophouse is the original one. Transformation of the shophouse makes the role of back alley important. We can grasp two housing lots types and four types of the way of utilizing the alleys.