China's main stock index Friday fell 3 percent to a 15-month low, and totally 13.84 percent decline in the week, making a more than 11 years biggest weekly decline record since December 1996.

The Shanghai Composite Index fell 88.73 points to reach 2,868.80, 53 percent lower than the historic highest points in last October. The smaller Shenzhen stock index fell 35.19 points, or 3.95 percent to reach 1034.14.

Analysts said the news that National enterprises who get out of line in investment will be called to account take a beating on the confidence of investors, and that China's central bank substantially raised the deposit reserve ratio as well as high international crude oil price and other factors all aggravate the decline of the stock index.