TOKYO, Sunday, April 11 (AP)—Communist China, backing the Pakistani Government's efforts in East Pakistan, accused India, the United States and the Soviet Union today of interfering in the internal affairs of Pakistan.

Peking's remarks were broadcast by the Hsinhua press agency and monitored here.

The Indian Government, the commentary said, has “massed troops along the East Pakistan border and even instigated armed personnel in civilian, clothes to infiltrate into Pakistan territory, for disruption and harassment.”

It also said the United States State Department had issued a statement “in an attempt to poke its nose into Pakistan's internal affairs” and that the Soviet Union had “acted more blatantly.”

The broadcast condemned the Soviet President, Nikolai V. Podgorny, for having sent a message to Pakistan's President, Agha Mohammed Yahya Khan, saying that the message “made no mention of the threat ‘posed by the Indian reactionaries to Pakistan, but on the contrary impudently criticized the Pakistan Government.” Mr. Podgorny asked President Yahya to show restraint.