Yttrium iron garnet (Y 3 Fe 5 O 12 , YIG) crystals have been widely used in microwave and magneto-optic devices due to their excellent magnetic and magneto-optical properties. Currently, the commercial material is YIG single crystal thin films, which is deposited on Gd 3 Ga 5 O 12 (GGG) substrate using liquid phase epitaxy technique.Herein, we report a new growth technology of YIG single crystal by top seeded solution growth (TSSG) technique from lead-free B 2 O 3 -BaF 2 flux. The maximum size and weight of the as-grown YIG crystal can be up to 43 mm× 46 mm×11 mm and 60 g, respectively. The crystals exhibit excellent comprehensive performances with narrow ferromagnetic resonance linewidth (0.679 Oe, 1 Oe=250/π A/m), high transparency (75%) and Faraday rotation angle (200 (°)•cm -1 @ 1310 nm and 160 (°)•cm -1 @1550 nm), indicating a good candidate in microwave and magneto-optic devices. More significantly, this growth technique is ideally suited to large size YIG or doped-YIG single crystals ascombined with the oriented seed crystal and lifting process, which can significantly decrease the manufacture cost.