China will expedite the passing of a proposed anti-monopoly law to keep overseas capital from controlling businesses critical to its security, the National Development and Reform Commission said on Saturday.

The country will also gradually reduce tax exemptions given to overseas firms and seek to prevent tax evasion by foreign companies, the nation's leading economic planning body said in a statement supplementing its 11th five-year plan for foreign investment.

The government is adjusting its policy on foreign investment under its new five-year plan to emphasize the quality of overseas capital rather than quantity, the planning body said in the statement, according to Bloomberg News.

China will also amend existing policies that don't support free competition between local and overseas firms, the statement said. It will also crack down on regional authorities which "blindly attract foreign investment."

The commission said it was worried an increasing number of leading firms had been bought by overseas enterprises.