BEIJING — As China’s economy slows, its military budget will rise by 7.6 percent this year, the lowest increase in six years and less than the double-digit increases that have been the norm for years, the government said Saturday at the opening of the country’s annual legislative meeting.

But in comments made ahead of the meeting, Fu Ying, a spokeswoman for China’s legislature, the National People’s Congress, gave no sign that Beijing would soften its stance on disputes in the South China Sea, and she renewed China’s warnings to the United States not to intervene there.

“This year, China’s military budget will continue rising, but more slowly compared to the previous few years,” Ms. Fu said at a news conference in Beijing on Friday.

The rise of 7.6 percent was revealed in Prime Minister Li Keqiang’s annual report to the legislature, and it would increase China’s military spending to $146 billion, Xinhua, the state news agency reported.