Changyi (Chinese: 昌邑; pinyin: Chāngyì) is a county-level city of Weifang, Shandong province, People's Republic of China.

In the Spring and Autumn and Warring States periods, the city served as the manor of Yanzi (晏子) and Sun Bin (孙膑).

Changyi is located in the northwest corner of the Shandong Peninsula and in the southern Bohai Laizhou Bay area, with geographical coordinates of latitude 36 ° 25'-37 ° 08 ', longitude 119 ° 13'-119 ° 37'.

Changyi's Petrochemical industry has an annual processing capacity of 10 million tons, and a sales income of 13.7 billion yuan.

The aquaculture industry currently has factory farming area of 230,000 square meters, producing over 140,000 tons of aquatic products, with the total output value of 820 million RMB.

The urban and rural household waste utilization project has applied for 13 Intellectual property in the People's Republic of China, passed the provincial assessment of science and technology achievements, and reached the international advanced level, and won major energy-saving achievement award of Shandong Province.

Jinsida Project of Treatment and Recycling of Printing and Dyeing Waste Water has applied for 12 national patents, and been included in the top 10 model technology projects of sustainable development in Shandong Province, winning the 3rd place of scientific and technological progress in Shandong.

Swiss electric company direct drive permanent magnet wind turbine won 11 national patents and is designated as one of the 2011 key projects of Shandong Province.

In recent years, construction of the "yellow-blue areas" has built up an opportunity of national strategic importance, and the city has gone all out to speed up coastal development.

At present, Binhai Economic Development Zone (Xiaying) has completed the infrastructure investing over 10 billion yuan, supporting an area of over 90 square km, and has built a 616 square km coastal development framework, which has formed the initial concentration of industry, and distinctive Northern coastal ecosystems of industrial uplift belt.

The first phase of the project invests 100 billion yuan to build twelve 10-thousand-ton berths with an annual throughput of more than 20 million tons.

Promote the administrative services, such as safety supervision, industry and commerce, environmental protection, taxation, finance and other departments in the coastal economic development zone were set up with strong staff, to provide zero-distance service for projects and business development.

In 2010, based on the Vocational Education Center, the Changyi Branch of the Institute of Weifang Technic School was established, and planned the construction of a new campus of Vocational Education Center, covering an area of 548 mu, with the building area of 200,000 square meters, total investment of 460 million yuan.

Vigorously implementing the primary and secondary school building safety standardization, the city has invested nearly 400 million for new school buildings of 290,000 square meters, more than 16 million to create “Shandong model county for experimental teaching in primary and secondary schools.” It invested more than 1900 million on implementation of the IT facilities and rural primary and secondary school distance education project.” Education quality has been steadily improved in recent years.