This article shows that

from the process of humaninhabitation in a region

from the main conditions to form river portsand mountainous towns and from the formation process

from river streetto riverside road

the water street is the embryo of river port formation.The cities along Changjiang are all set up and flourished by ports.Thisexplains the importance of port and city river line.Two examples ofriverside road planning of a small riverside town are given.