Abstract: In the course of readjustment and optimization of industrial structure,it is necessary to expedite reconstruction,transformation and upgrade of traditional industries and development of new industries and to push forward vigorously ecological transformation of the industries and establishment of ecological industries.Based on a large number of case-studies,major principles and strategies for development of ecological industries are addressed,such as market-orientation; ecology and holistic optimization;integration of competition,symbiosis,self-resilience and regeneration;minimization-and-recycling-based circulatory economy;exertion of regional advantages;better elasticity of structure and function,self-regulation,integration hardware,software and mindware;and offering of more job opportunities.