Near-stoichiometric LiTaO_3 (SLT) single crystals were grown from Li-rich solutions by the double-crucible Czochralski (DCCZ) method using an automatic coarse-grained SLT powder supply system. The influence of supply on compositional uniformity of the grown SLT crystals was investigated and compositional uniformity of SLT crystals was estimated by the measurement of Curie temperature.