The effect of sputtering conditions on magnetic properties of CoCrMo/Cr magnetic thin film was investigated. Substrate temperature were controlled from R. T to $250^{circ}C$. The thickness changes of Cr underlayer and CoCrMo magnetic layer were in the range of $1000-2500AA$ and $300-800AA$, respectively. Grain size was found to be decreased with increasing magnetic layer thickness(from $500AA$ to $800AA$). CoCrMo magnetic layer microstructure showed relatively small dependence on Cr underlayer thickness, substrate temperature. Coercivity increased with increasing Cr underlayer, magnetic layer thickness and substrate temperature. CoCrMo/Cr thin film showed a coercivity of 880 Oe in $700AA$ magnetic layer thickness and $1000AA$ Cr underalyer thickness.