China refuses to recognise the Philippine case and says all disputes should be resolved through bilateral talks.
Beijing has stepped up its rhetoric ahead of an expected ruling by the Permanent Court of Arbitration in The Hague on the Philippines case.
China claims almost all of the energy-rich South China Sea, through which more than $5 trillion of maritime trade passes each year.
The Philippines, Brunei, Vietnam, Malaysia and Taiwan have overlapping claims.
"As far as I k**w, there are more than 40 countries that have made statements or made their positions k**wn through all kinds of means," Foreign Ministry spokeswoman Hua Chunying said at a regular briefing.
"She added that any unbiased country would support China. countries including Burundi, Slovenia, Niger and Mozambique had pledged their support for China, the Foreign Ministry said this week.