Abstarct: This research has been performed in order to optimization of blasting in Jajarm limestone mine. Image processing method has been used to determine size distribution of fragmented limestone by blasting, and after comparing Split Desktop and WipFrag in different conditions, Split Desktop selected as the proper software for image processing. The results of size distribution for fragmented limestone by exsiting blasting pattern with 2.4×2.8 m2 drilling network show, 19 percent of fragmented rock mass are 0 to 30 mm (fine), 11 percent are 30 to 70 mm, 13 percent are 70 to 140 mm and 57 percent are over than 140 mm. In this project, joint studies has been performed in scan-line and surveying window method. There are 3 major joint set in the case study region, that the first joint set and the second joint set are approximately parallel and the third joint set in perpendicular to them. After analisys of surveyed discontinuities, the discrete fractures network (DFN) has been created and validated with real conditions, that error magnitude estimated abou 8 percent. Primary blasting pattern was designed by energy transition theory and it’s results compared with some empirical method for designing blasting pattern. Primary pattern proposed with 2.6×2.9 m2 drilling network and it has staggered array. This pattern has 5 row of holes and each row contains 14 hole, that length to width ratio for blasting is equal to 3.1. According to bench joint system, proper direction for blasting has been selected in eastern bench of Jajarm limestone mine. Holes rows should drilled along 145 (or 325) degree and Proper direction for blasting is perpendicular to holes row align. Bench blasting has been performed in 3 trial full scale blasting, that the first and the second blasting performed with 2.6×2.9 m2 drilling network and the third blasting performed with 2.7×3.25 m2 drilling network. holes pattern is in staggered array in the third trial blasting, too. Specific charge in the first, the second and the third blasting are 0.21, 0.27 and 0.23 kg/m3 respectively. After performing the trial blasting, generation of fine reduced to 9 percent (19 to 10 percent) and 56 percent of fragmented rock mass contain limestone with 30 to 140 mm size. Therefore, the third blasting pattern with 2.7×3.25 m2 drilling network has been selected and proposed as proper blasting pattern in Jajarm limestone mine. Finally, the proposed blasting pattern has been evaluated from technical and economic aspect, and its benefit will be about 9.5 billion Rials in year.