Purpose: This project is to apply linear programming model to decide which surgery should be assigned to which block to reduce idle time in order to improve operating rooms utilization rate to meet industrial standard which is above 80%. Problem Description: Let us assume that one hospital in Cincinnati area has 3 operating (OR) room types (Table1) used by 5 total surgical groups (Table 2), which need to be allocated time in the master schedule. These ORs open five days a week (Table 3). The operating hours for all ORs varied from 6.5 hours to 9 hours per day. The total target hours are 392 for all surgical groups with each surgical group having specific target hours (Table 4)