"SSE science and technology innovation board 50 constituent stock index", referred to as "Kechuang 50" for short, with the index code of 000688, consists of 50 securities with large market value and good liquidity in science and technology innovation board of SSE, which is the primary index reflecting the performance of securities prices in science and technology innovation board and a part of the multi-level market index system of SSE.

The benchmark date of the Science and Technology Innovation 50 Index is 20 19 12 3 1, and the base point is 1000. According to the announcement of the Shanghai Stock Exchange, Kechuang 50 will release the historical index market after the close on July 22, 2020, and officially release the real-time market the next day.

The outstanding scientific and technological attributes of Kechuang 50 sample company are mainly reflected in two aspects. First, the proportion of R&D investment is high, and the average R&D expenditure of sample companies accounts for13% of operating income; Second, the performance growth rate is fast. In 20 19, the operating income and net profit of the sample companies increased by 13.4% and 28.8% respectively. There were 4 companies with an increase of more than 50%, 2 companies with an increase of 30%-50%, and 6544 companies with an increase of 20%-30%.