BEIJING — President Trump is poised to add six new trademarks to his expanding portfolio in China, in sectors including veterinary services and construction, potentially renewing concerns about his possible conflicts of interest.

The latest trademarks expand Mr. Trump’s business interests in China, the world’s second-largest economy and a country he frequently blamed during the election campaign for the decline in American industrial jobs. Since taking office, he has softened that rhetoric.

He has nevertheless continued to receive approval in China for new trademarks. The country’s trademark office gave the president preliminary approval for six trademarks on June 6, according to the agency’s website.

Under Chinese law, a trademark with preliminary approval is formally registered after three months if the agency receives no objections. If granted, the trademarks could allow Mr. Trump to expand his business interests in scientific and technological services, construction projects and medical and veterinary services.