The electronic structure of ThCr2Si2-type compound namely CaNi2Sb2 with space group I4/mmm (139) were studied by means of Full Potential –Linearized Augmented Plane Wave Method (FP-LAPW) method in order to explore their existence and changeable chemical bonding nature in between the atoms on CaNi2Sb2 compound at ambient condition and under compressions. Based on this bonding nature the possibility of iso structural transition in this compound is disclosed.