Cesar Nakazaki, Fujimori's lawyer, said that he would be show the former president was innocent of "the policies he implemented against the terrorism he was confronted with in the years 1991 and 1992".Human rights allegations
He is accused of human rights violations related to the killings of 15 people by security forces at a party in Lima in 1991 and the deaths of nine students and a professor in 1992.
A truth and reconciliation commission later found that none of the victims were connected to the Shining Path, which had carried out an armed campaign against the government.
Fujimori also faces charges over the kidnapping and detention of a journalist and businessman critical of his regime.
The trial will seek to determine whether he ordered or knew about the crimes, as alleged by Santiago Martin Rivas, a former operations chief of the La Colina death squad.
The 69-year-old denies any involvement in any of the killings and on Monday angrily protested his innocence.
|"If there were horrible things done, it was not on my order and I condemn them"|
Alberto Fujimori, former Peruvian president
"I declare myself innocent," he said in court. "I don't accept the charges against me ... I never ordered the death of anybody."
Fujimori also defended his decade in office, saying he had turned around a country "that was virtually collapsing".
"My government defended the human rights of 25 million Peruvians, without a single exception," he said. "If there were horrible things done, it was not on my order and I condemn them."