The five Yingluck coalition parties are Pheu Thai, Chat Thai Pattana, Chat Pattana Phua Pandin, Palang Chon and Mahachon.
The announcement came one day after the July 3 election which saw her party won over Democrat Party of Abhisit Vejjajiva.
She stressed "reconciliation" must take place and economy be rebuilt. She said the Kanit na Nakhon panel, which was set up by the Abhisit government to investigate fact behind the bloody violence, would be invited to go on working.
"Corruption is another problem that we will solve," Yingluck told a press conference.
"299 is a beautiful number", Yingluck said of her government's strength.
Replying to questions from reporters, Yingluck insisted the Pheu Thai had no policy to grant amnesty for a single person.