Sr 2? /Ba 2? modified potassium sodium niobate transparent ceramics [(K 0.5 Na 0.5 ) 1-2x (Sr 0.75 Ba 0.25 ) x ] 0.93 Li 0.07 Nb 0.93 Bi 0.07 O 3 (KNNLB:Sr 2? /Ba 2? ) were fabricated via hot-pressing, using Li and Bi as sintering aids. The crystal structure, microstructure, optical, piezoelectric and dielectric properties of KNNLB with varied Sr 2? /Ba 2? content were investigated. The optical transparency of such ceramics is up to 60 % in the UV-visible region and close to 100 % in the infrared region. Moreover, the optimum dielectric and piezoelectric performances of e r = 1679, d 33 = 151 pC/N and tand = 0.026 were obtained for KNNLB:Sr 2? /Ba 2? ceramics with x = 0.025. Consequently, the doping of Sr 2? /Ba 2? is considered as an effective way to improve electrical properties and maintain excellent optical properties of the fine-grain transparent ceramics.