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The Engineering Index (EI) is a well-known multidisciplinary engineering literature search tool. Founded in 1884, it is now published by The Engineering Information Inc and has a history of more than 110 years. Over the past century, EI has been continuously improved and has now become a world-class authoritative retrieval system and an internationally accepted source of literature statistics.

The Engineering Index is an abstract that mainly reports engineering and technical information, including: chemical engineering, agriculture, biological engineering, environment, geology, civil engineering, fuel engineering, petroleum, metallurgy, minerals, instrument data, industrial management, nuclear energy, aerospace engineering, automobiles and locomotives, control engineering, electrical engineering and electronics, and soft science and soft engineering. The engineering ** excerpts from EI are highly selective and responsive to new and marginal disciplines.

EI is available in a variety of versions, such as book, CD-ROM and machine-readable for international connection. These facilitate the effective use of EI by readers.

The types of literature included in EI include: journals, books, conferences**, technical reports, etc., with more than 3,500 journals and more than 2,000 conference proceedings collected annually. Of these, 10 were from non-English speaking countries.

EI is favored by scientific and technological personnel because of its simple retrieval procedures, intuitive and large amount of information, and scientific and technological personnel often browse EI to find those scientific and technological information related to themselves, grasp the development trend of the discipline, and incorporate their own scientific practice into the general trend of the world.

As a worldwide engineering literature retrieval system, EI pays more attention to engineering and technical journals and journals in various countries, and constantly updates the varieties of journals. We have made statistics on the 10 years of Chinese journals included in EI, and found that although the total number of Chinese journals included in EI has reached 7 0 and 80 in the past 10 years (see Table 2), there are only more than 10 journals that have been included in more than 10 consecutive years, and most of the journals are in a state of change and fluctuation, and some have even been eliminated. The purpose of EI is academic rigor, and the criteria are high level, strong practicability, high quality, and timely publication.

Despite the information in today's world, we still strictly control the quality and do not use it excessively.

The Engineering Index (EI) was founded in 1884 and is an American Engineering Information Inc) is a well-known comprehensive search tool for engineering and technology. EI publishes 1 issue per month, with 10,000 to 10,000 abstracts; Each issue is accompanied by a subject index and an author index; An additional annual volume and an annual index are published each year, and an index of author affiliations has been added to the annual index.

It is published in print (in the form of a journal), in electronic form (on tape) and on microfiche. EI selects more than 3,500 journals and more than 1,000 conference proceedings, scientific and technological reports, standards, books and other publications in 15 languages from dozens of countries and regions in the world. More than 160,000 articles are reported annually.

The literature included in the collection covers almost all fields of engineering and technology. For example: power, electrician, electronics, automatic control, mining and metallurgy, metal technology, machinery manufacturing, civil engineering, water conservancy, etc.

It has the characteristics of strong comprehensiveness, wide range of information, wide geographical coverage, large amount of reports, high report quality, and strong authority.

The Engineering Index (EI) [1] is a world-renowned search tool developed by Engineering Information IncFounded in 1884, the company is one of the world's largest providers of engineering information, publishing printed editions, microforms and other information products in the early days, and began to provide EI Compendex database services in 1969. EI is characterized by a comprehensive and high-level collection of literature in the field of engineering and technology.

EI includes more than 5,000 engineering journals**, conferences**, and scientific reports. The scope of the collection includes nuclear technology, bioengineering, transportation, chemistry and technology, optics, agriculture and food, computer and data processing, applied physics, electronics and communications, materials, petroleum, aeronautics and automotive engineering.

EI began to include Chinese journals in 1992. In 1998, EI established the EI China Mirror Station in the library of Tsinghua University.