A member of the Gang of Four accused one of his codefendants today of plotting an armed rebellion in Shanghai to keep Deng Xiaoping, China's current top leader, from coming to power following the death of Mao Tse-tung. c

The special court trying the four and six other former Chinese political and military leaders wound up its case against two more of the defendants, leaving only Mao's widow, Jiang Qing, still in the dock.

In what could be the final investigative session of the court, Gang of Four member Wang Hongwen admitted he participated in an alleged plot in 1966 to raise a rebellion in Shanghai by 100,000 heavily armed militiamen against the regular Army.

Wang, who has testified against all his fellow Gang members including Jiang Qing, told the court that fellow Gang member and Shanghai mayor, Zhang Chunqiao, masterminded the Shanghai rebellion.

Its purpose, he said, was to keep Deng, who has been purged during the Cultural Revolution but was still highly regarded by the Army, from returning to power.

Wang, a former Communist Party vice chairman, admitted he organized the Shanghai militia into a formidable force of 100,000 men armed with tanks, howitzers, rockets, antiaircraft guns and motorized units, the official New China News Agency said.

But he said it was Zhang who conceived the plot and gave the orders.

Zhang, the tough leftist propagandist who helped catapult Jiang to power, sat in stony silence as he has in all previous hearings.

According to the indictment, the Shanghai militia was mobilized for an uprising after Shanghai leaders learned of the arrest of the Gang members in Peking in October 1976, a month after Mao's death.

The plan was to launch a last-ditch fight with the regular Army to win the release of the radical leaders and create disorder across the country, the document said.

The court said its investigation into Zhang and Wang was conducted and that they had been shown to be guilty. That left only Jiant, whose investigation apparently remained incomplete.

Defense attorneys are expected to make brief representations for five of the defendants who asked for legal help. The panel of judges then will deliberate and deliver a verdict.