BEIJING, Oct. 16 — Chinese officials warned the United States not to honor the Dalai Lama, saying a planned award ceremony for the Tibetan spiritual leader would have “an extremely serious impact” on relations between the two countries.

Speaking at a Foreign Ministry briefing and on the sidelines of the Communist Party’s ongoing 17th National Congress, the officials condemned the Dalai Lama as a resolute separatist and said foreign leaders must stop encouraging his “splittist” mission.

“Such a person who basely splits his motherland and doesn’t even love his motherland has been welcomed by some countries and has even been receiving this or that award,” Tibet’s Communist Party boss, Zhang Qingli, told reporters during the congress.

“We are furious,” Mr. Zhang said. “If the Dalai Lama can receive such an award, there must be no justice or good people in the world.”