On the second day, the focus is expected to be on Prime Minister Yingluck Shinawatra for alleged mismanagement of administration, the Bt300 minimum daily wage policy and the rice pledging scheme.
Under the no confidence motion, filed earlier by the opposition party, Ms Yingluck, her deputy Chalerm Yubumrung, Defence Minister Sukumpol Suwanatat and Deputy Interior Minister Chat Kuldilok, also former deputy transport minister, were under scrutiny for mismanagement leading to corruption.
The motion also calls for the premier to be questioned for her failure to deliver results in accord with her policy statement earlier pledged to parliament.
The opposition started grilling the Yingluck administration Sunday in a three-day timeframe for the censure debate, and the no-confidence vote is set for Wednesday.
Ms Yingluck’s six-party ruling coalition holds about three-fifths of the seats in the lower house.