The aim of this study was to evaluate the effects of different straw volume (0.5 and 5.0 ㎖) oncryopreservation in boar semen. Semen quality was evaluated the motility, viability, abnormality, acrosome intactness and membrane integrity. And there were also examined the development rates of IVM/IVF embryos using frozen-thawed boar semen. Boar semen were frozen until 5℃ for 3 hours using cell freezer and making the straws, and then freezing by lowing the straws into styrofoam box on the 8 cm above the LN₂. In different straw volume (0.5 and 5.0 ㎖), sperm viability and abnormality were not differ in 0.5 and 5.0 ㎖ straws, but sperm motility were significantly higher in 0.5 ㎖ straws (61.3%) than in 5.0 ㎖ straws(56.3%) (p<0.05). In the Coomassie Brillient Blue (CBB), Hoechst 33258/Propidium Iodide (H258/PI) stainingand Hypoosmotic Swelling Test (HOST), the acrosome intactness and sperm membrane integrity were notdiffer in 0.5 and 5.0 ㎖ straws, but sperm survival rate was significantly higher in 0.5 ㎖ straw (65.0%) thanin 5.0 ㎖l straw (55.0%) (p<0.05). Employing the Chlortetracycline (CTC)/Hoechst33258 (H258), all treatmentgroup were not differ in characteristic of uncapacitated acrosome-intact sperm (F), capacitated andacrosome-intact sperm (B-type) and acrosomereaction seprm (AR-type). In the developmental rate ofIVM/IVF embryos using frozen-thawed boar semen in different straw volumes, the developmental rate ofmorula plus blastocysts were 19.9% in 0.5 ㎖ straw and 18.8% in 5.0 ㎖ straw, respectively. These resultsindicated that straw volume affects the semen motility and sperm survival rate, but not other semencharacteristic and developmental rate of IVM/IVF embryos.