The famous German decorative artist Franz Salsmer has made a definition for the decoration-"decoration is the use of the various elements that make the object beautiful and  its process."and at the same time give two general definitions "Decoration dollows a systematic,regular,symmetrical or other law that combines into a geometric form";"decoration is produced by the planning of a decorative expert,which allows the weights of the world to be It is surrounded by organic objects such as plants,animal or humans,and it also provides the natural phenomenon of crystal form(snow flakes,clouds,waves and other inorganics)as a decoration."
   Today,decoration and function have been difficult to draw a clearer boundary.This book starts from this point of view：metal decorative art belongs to the category of architecyural decorative art,following all the principles of architectural decorative art design, and has its own unique.Because in many respects,it has been continuously improved with the development of modern science and technology,especially the rise of machine science has injected new vitality into its development. 
2.Feactures of decorative metal mesh art design
Goethe said"The greatest artistic skill lies in knowing how to limit one's own scope,and not to let it go."Therefore,it is very important to limit the scope of metal decorative art.Metal art decorative can ba summed up as a decorative art of architecture and environment with metallic materials.As the design of metal decorative art,its design principles and methods are not only related to the art design of architecture and environment,but also have its own characteristics.
First,the decorative metal mesh art design material is unique.It is limited to metal materials or synthetic materials based on metal materials.
Second, the decorative metal mesh art design needs to take into account the function of the decorative building and the environment.It is often necessary to consider the form of the building structure and certain functions of the structure.
Third,the designer of the decorative metal mesh must give full play to the unique properties of the metal materials in order to achieve a good artistic effect.It is difficult to do this without a lack of understanding of the metal materials.
In addition,the decorative metal mesh design must consider the main function of the building.That is ,some types of buildings such as healing or villas should use less metal materials.