There are two most important things in old town reconstruction: the functional reconstruction and landscape regeneration. Purpose is to restore its ability of sustainable development. In landscape architecture, planning industry refers to the land for a certain range of perceived visual things and events , as well as the art of relationship with the surrounding space organization. What is the public landscape, the author thinks that the public landscape is within the category of landscape, is open to the general public, is the landscape place for public use, enjoy and entertainment. Such as city square, commercial landscape, street landscape, residential landscape,, mountain landscape, waterfront landscape, etc.Old city reconstruction of four kinds of modes: completely torn down; keep the old city, nearby building auxiliary city; the continuation of historical context, the whole old as sweet; keep the old appearance, update of internal functions. Four patterns, the old as before and update the internal function of two models design provides a platform for regeneration. Environmental regulation is the foundation in the old city reconstruction, public landscape construction is the key, the public landscape regeneration can be designed on the basis of the original resources; using the landscape design methods to existing resources for rebuilding, expansion or repair, realize the value of reuse. The old town has a lot of historic culture, which is the soul of the city, in the process of public landscape regeneration design, place spirit of the city is also the key in the process of transformation. Both the pursuit of enjoyment on the vision and the pursuit of the heart of comfort, regenerative designs are effective methods.