A novel ternary lithium strontium borate Li 2 Sr 4 B 12 O 23 crystal with size up to 20mm×10mm×4mm has been grown via the top-seeded solution growth method below 730°C. Single-crystal XRD analyses showed that Li 2 Sr 4 B 12 O 23 crystallizes in the monoclinic space group P2 1 /c with a=6.4664(4)Å, b=8.4878(4)Å, c=15.3337(8)Å, β=102.02(3)°, Z=2. The crystal structure is composed of [B 10 O 18 ] 6− network and isolated [B 2 O 5 ] 4− unit. The IR spectrum further confirmed the presence of both BO 3 and BO 4 groups. TG-DSC and Transmission spectrum were reported. Band structures and density of states were calculated.