VACAVILLE, Calif., Dec. 2 — Mass murderer Charles Manson, imprisoned for masterminding the grisly murders of pregnant actress Sharon Tate and six others, Wednesday again was denied parole at a hearing in which he was described as a “walking advertisement for the death penalty.”

It was the fifth time the state parole board rejected the cult leader. His next parole hearing was scheduled for December 1985 under a new law that allows a maximum interval of three years.

Manson boycotted the 55-minute hearing in apparent pessimism about his prospects for freedom. He also refused to allow a lawyer to represent him.

Frank Coronado, chairman of the parole panel, said Manson’s direction of the Tate-LaBianca slayings in 1969 and two other killings was “cold-blooded and senseless.”

“All the murders were orchestrated by Charles Manson,” he said. “These cruel, callous and heinous crimes demonstrate a complete disregard for human life and suffering.”

Deputy District Attorney Stephen Kay of Los Angeles County, who prosecuted Manson in 1970, called him “a walking advertisement for the death penalty.

“Manson thinks he’s the No. 1 criminal in America and feels he must live up to that reputation,” he added.

Kay said if he were released, he would lead followers in further killings because “Charles Manson is a law unto himself. Charles Manson believes he can do anything he wants whenever he wants.”

A prison psychiatrist’s report recommended Manson be pulled out of the psychiatric ward because he is nothing more than a “psychiatric curiosity or oddity.”

Prison counselor Ernest Caldren told the panel that Manson had never gone beyond the “fantasy level” in making plans for parole.

“Charles Manson has a pattern of cycling in his behavior,” Caldren said. “There are short-lived periods of time of cooperation and then he turns and threatens staff, particularly the inexperienced, with violent behavior.”

Parole has never been a reasonable possibility for Manson because none of his followers convicted in the bloody Los Angeles murders has received a release date.