張斌（齊魯工業(yè)大學(xué) 山東省科學(xué)院，山東 濟(jì)南 250000）

Abstract：Practice needs theoretical guidance and theory needs to be verified and perfected in practice.Practice and theory complement each other and are indispensable.In the same way, the design activities are also the same.The design activities originate from the demand of the market.The market demand is derived from the needs of the society and the users.The market demand is the symbol of the social progress and civilization, because there is a demand for progress, and the demand will bring social and economic benefits.For industrial design majors, this demand drives the progress of product.

First, The lack of theory and principles of the design of the form of expression

With the continuous development of society, science and technology are changing with each passing day.When technology is no longer the first factor to consider at the beginning of product design, then product design will usher in a new era.At present, technology is still the first consideration in the design activities of industrial product designers.This problem has become the main obstacle to the design of appearance form.It is believed that after the problem is solved in the near future, the aesthetic of product design becomes more and more important because it seems to be all now.The product is still a form of service function.This problem has created a single form of the same product, poor shape, the form follows the functional shape design.

For example, the world's first printer, his appearance changed the handwritten revolution, and his professional field achieved great success, but his appearance seemed to be "ugly"with today's aesthetic eyes, without a sense of design, a rough shape with a rough texture, only a package with a package function.It all comes down to the first industrial revolution,with emphasis on function and light form.In short, there is no theoretical guidance and lack of design principles leading to this phenomenon.

Two.The importance of theory and principle to the importance of design.

The progress of industrial products appeared in Bauhaus,Germany, combining form with beauty and function, laying the foundation for modern design education.The trend of the compatible product development of the United States and the functional technology has also become the development direction of the industrial design.The first industrial revolution, for the present product design, is only from the appearance form.The first generation of World Expo "Crystal Palace" was an engineer rather than an exhibition of design and architectural design, until the emergence of the first American product designer Raymond rove injected an effective drug into the industrial design of the United States.At that time,Rove's design firm was successful, not only the largest, but also the influence extended to all countries in the world.ROI was invited to teach lectures by Japan, Russia and other countries as a successful lecturer.

Three.The principle of product design today

Modern product design is an organic combination of technology and art.The essential problem to be solved is the formalization of the relationship between products and people,which needs to meet the needs of function and aesthetics.The form of product design can not be separated from the aesthetic category.Excellent product design is an organic combination of technology and art.Today's product design is no longer the function of "form following function".With the progress of the society, the material wealth and spiritual wealth are becoming more and more rich, and the product design has evolved into life.The way of design, in a sense, has become an art of improving the quality of life and the taste of life.Product design shows human care, product pursuit of spiritual needs,satisfaction and enjoyment, because the enjoyment of the spirit is endless, leaving a broader space for the market.The product designed as a designer must conform to the present environment, meet the needs of the society, meet the needs of the user, that is, the beauty of the product should be joined in the design.The beauty of the harmonious beauty is a beauty of state, a balance of beauty, and a standard and principle of design.It is embodied in the harmony between people and products, the harmony of design itself, and the harmony between design and environment.