Marine Sgt. Clayton J. Lonetree pleaded not guilty yesterday to charges that he passed secrets to the Soviets, as prosecutors tried to introduce evidence they said would show that the former Moscow embassy guard is anti-American.

The chief military prosecutor, Marine Maj. David L. Beck, said items seized from Lonetree include materials printed in Russian and books on Leninism. Beck also said he wants to introduce high school notebooks in which Lonetree's doodles include swastikas.

Defense attorney Michael Stuhff disputed the contention that Lonetree's Soviet flag and high school notebooks indicate anti-American views. Military personnel often acquire memorabilia from their foreign posts, and adolescents commonly make antisocial doodlings in school, he said.

Beck also said Lonetree will be allowed to take meals with other brig inmates, play cards and basketball with them and attend religious services in the brig chapel.

But Beck said the government rejects suggestions that Lonetree be allowed to visit with journalists. Stuhff said Lonetree should be allowed to hold a news conference.

The military judge, Navy Capt. Philip F. Roberts, told Beck to present a brief explaining why Lonetree should not be allowed to talk with reporters in the brig.

The military has expressed concerns that interviews with Lonetree could lead to national security leaks, but Stuhff said the government does not want Lonetree to tell his side of the story because it could contain truths the government would find embarrassing.

The 25-year-old St. Paul, Minn., man is accused of letting an affair with a Soviet woman seduce him into spying. He faces life in prison if convicted.

The defense contends Lonetree gave the Soviets nothing of value.