Maintenance refers to the development of the software has been completed (analysis, design, coding and testing) work and delivery of future use, a number of software engineering software products performed activities. That is according to the situation of industrial software design software running on the software appropriately modified to accommodate the new requirements for electronic software design, as well as error correction operation found. Writing software problem reports, software modifications report. A medium-sized software, if it takes time to develop office software design stage one to two years, after it put to use software design, its operating or working time may last five to ten years. Then its maintenance stage also running during this five to ten years. In software development platform software development platform from the tedious practice development process. Developers commonly used functions in practice, classes, abstract interface to summarize, package, has become a reusable "middleware", and as "middleware" mature and versatile, more powerful, more to meet the needs of enterprise customers - software development platform emerged. Electronic software design, software design Changchun, Shenyang and HSBC provided by the Shenyang City HSBC and Information Technology Center. Shenyang City HSBC and Information Technology Center (www.4000010001.com) (www.tz1288.com) strong, credible, in Shenyang, Liaoning province IT project cooperation industry has accumulated a large number of loyal customers. The company better work attitude and constantly improving innovative ideas will lead abundance and information technology center and you hand in hand into the brilliant, for a better future!