Composite Index also lost 0.1 percent, to 2,938.32 points.
The CSI300 was down 0.6 percent for the week and 1.9 percent for the month, while SSEC dipped 0.7 percent and gave up 2.2 percent for the respective periods.
Investors have become increasingly cautious amid rising worries about corporate creditworthiness.
Hong Kong shares dropped over 1 percent on Friday as sentiment was soured by a tumble in Japanese stocks, after the Bank of Japan disappointed markets by electing not to expand monetary stimulus on Thursday.
The Hang Seng index fell 1.5 percent, to 21,067.05, while the China Enterprises Index lost 1.3 percent, to 8,939.47 points
Reference: Reuters
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