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Although titanium dioxide (TiO 2 ) is a non-magnetic semiconductor material nevertheless it can be transformed into a magnetic semiconductor material, i.e. diluted magnetic semiconductor (DMS), by adding impurities which have magnetic properties. Transition metals are good candidate impurities to be added to TiO 2 to form a DMS. This paper reports our investigations on the trends of electronic structure and magnetic properties of TiO 2 based DMS with transition metals impurities (Sc, V, Cr, Mn, Fe, Co, Ni, Cu and Zn) by using density functional theory (DFT). TiO 2 -Fe and TiO 2 -Mn have big magnetic moment, with the values are about 4.21 Bohr Mag/cell and 3.48 Bohr Mag/cell, respectively. However, based on density of states, TiO 2 -Sc and TiO 2 -Ni have no change the magnetic characteristic of pure TiO 2 .Based on the magnetic and semiconductor properties, the candidates for DMS are TiO 2 -V, TiO 2 -Cr, TiO 2 -Mn, TiO 2 -Fe, and TiO 2 -Co system.

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