Manila is to file as scheduled its "memorial", or formal pleading on Sunday, which would allow the UN arbitral tribunal to study the Philippine argument that the Chinese claim covers parts of Filipino territory, officials said.
Abigail Valte, a spokeswoman for President Benigno Aquino, said the government was pursuing the case despite official Chinese warnings of fallout in bilateral relations.
"At least for the Philippine government we can say that all factors have been taken into consideration when the discussions were being had on the matter of the arbitration," she told reporters.
The Philippines, whose forces are dwarfed by its giant neighbour in an increasingly tense stand-off over some reefs and shoals, sought UN arbitration in January 2012 to settle the dispute, but China has rejected the move.
China's foreign ministry spokesman Hong Lei warned the Philippines on Wednesday against proceeding with the UN case.
"China will never accept nor participate in the international arbitration unilaterally initiated and pushed by the Philippines, and China's position has a solid basis in international law," Hong told a news conference in Beijing.
Valte said the Aquino government was aware the UN tribunal may not be able to enforce its ruling if it decides against China.
"(But) at least assuming that a favourable decision (for the Philippines) is rendered, then that is additional weight for the Philippine position," she said.
The Philippine case alleges that Chinese claims to areas of the South China Sea and its seabed cover areas as far as 870 nautical miles (1,611 kilometres) from the nearest Chinese coast, and are thus illegal under the UN Convention on the Law of the Sea.
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