Recently, LaSrMoReO6, LaSrMoTcO6, and LaSrVOsO6 have been predicted to be compensated half metals. In this study, they were re-examined by including both the electron correlation and spin-orbit coupling (SOC) effect. It was found that for LaSrMoReO6 and LaSrMoTcO6, the spin-orbit coupling effect is minor, while the electron correlation plays the vital role in governing the half metallic properties. At selected U values, LaSrMoTcO6 is half metallic, while LaSrMoReO6 becomes a semiconductor. For LaSrVOsO6, the cooperative effect of the electron correlation and SOC effect makes LaSrVOsO6 being a semiconductor. (C) 2010 Elsevier B.V. All rights reserved.