  The magnetic properties of CaCo$_{2}$As$_{2}$ single crystal was
systematically studied by using dc magnetization and magnetic torque
measurements. A paramagnetic to antiferromagnetic transition occurs at $T_N$ =
74 K with Co spins being aligned parallel to the c axis. For $H \parallel c$, a
field-induced spin-flop transition was observed below $T_N$ and a magnetic
transition from antiferromagnetic to paramagnetic was inferred from the
detailed analysis of magnetization and magnetic torque. Finally, we summarize
the magnetic phase diagram of CaCo$_{2}$As$_{2}$ based on our results in the
\emph{H-T} plane.
