EI retrieval is the engineering index: the engineering index (EI for short) was founded in 1884, which is a famous comprehensive retrieval tool for engineering technology published by engineering information companies. EI retrieval is published every month 1 issue, from 13000 to 14000 abstract; Each issue is accompanied by a subject index and an author index; There is also an annual volume and an annual index every year, and the annual index also increases the author unit index. The collected literature covers almost all fields of engineering technology. For example: electric power, electrician, electronics, automatic control, mining and metallurgy, metal technology, machinery manufacturing, management, civil engineering, water conservancy, educational engineering, etc. EI retrieval has the characteristics of strong comprehensiveness, wide data sources, wide geographical coverage, large amount of reports, high quality of reports and strong authority.

EI is a global database, similar to HowNet in China. But not all articles can enter EI, and all the articles entered represent authority and high quality. Therefore, EI is called the global core and is recognized by every country. It is generally used for evaluation of masters, doctors, associate professors and professors. After the papers published by the author in international conferences or magazines are included in EI, some domestic authorities can issue EI inclusion certificates to the author.

As the world's leading online information service provider of applied science and engineering, EI has been committed to providing the most professional and practical online data, knowledge and other information services and support for researchers and engineers.