  Cascade mixing provides an elegant place to study the $B^0-\bar{B^0}$ mixing.
We use this idea to study the CPT violation caused by $B^0-\bar{B^0}$ mixing.
An approximation method is adopted to treat the two complex $B^0-\bar{B^0}$
mixing parameters $\theta$ and $\phi$. A procedure to extract the parameters
$\theta$ and $\phi$ is suggested. The feasibility of exploring the CPT
violation and determining of $\theta$ and $\phi$ in the future B-factories and
LHC-B is discussed.
