Stormwater is a resource, but the traditional stormwater management practices treat it as a waste and cause many problems. Green Street is a new method to manage the street stormwater runoff through the landscape architecture application. By analyzing the origin, definition and function of the Green Street, it can draw a conclusion that the Green Street originates from America, it is a street that uses natural process to manage stormwater runoff at the source, and it can improve street water environment, create attractive streetscape, enhance neighborhood livability, etc. Also, the Green Street has five different types, including stormwater curb extension, stormwater planter, stormwater swale, pervious paving and infiltration garden. Finally, through analyzing two examples of Green Street application in Portland, Oregon, it proved that Green Street is a high effective and low-cost method to manage the street stormwater runoff. In brief, Green Street will have increasingly important significance for the street stormwater management when it is used widespread gradually.