Amid the ever-increasingly industrial ecology changes and transformations, the Taiwan design firms have thus started applying each one's own product R & D technologies and brand marketing capacities and manufacturing and marketing channel advantages on developing own brands and products instead of simply offering the proxy design consultancy and creation services. The design gaining consumer market popularity shall synchronize with the economic scale and marketing mechanism. Many domestic scholars did concentrate on researching the product R & D for the "Corporate Design Division". It is initialized in this research by targeting on the design corporations with "Own Brands and Products" and applying in-depth interview with the management of the Taiwan Design Firms for positioning the development status, R & D procedures, management methodologies and success or failure factors of the Taiwan Design Firm Industry so that there can constitute sound grounds for own products and brands developers' references in the future. There have concluded in this research that: A. What the Taiwan Design Firms have started developing own products and brands can result from the overall Taiwan industrial transformation and development. The business operation mechanism of this industry mainly resorts to international and domestic exhibitions for marketing the products and aggressively developing the cross-industrial strategic alliance and joint venture for developing new products and grabbing the marketing potentiality. B. What is the most critical for the Taiwan design Firms shall be the stage of “product design concept trends in the initial development timing”. The corporate management usually adopts the Project-Management, Open-Style Management and emphasizes the originality and sovereign of the design projects. C. The critical successful factors for the design firms developing own products and brands shall include “Precise Brand Positioning”,“Absolute Stick To the Brand Concepts and Perpetual Marketing New Products”,“Controlling the Additional Core Values of the Design Firms”. The factors contributing to the failure of the design firms usually include “The Product Incompatible Marketing Popularity, Lacking Precise the Usage Niche Market and End-Users and Demonstrating Low Product Popularity and Recognition”.