CCAST, World Lab, Beijing 100080, Peoples R China
; Inst High Energy Phys, Beijing 100039, Peoples R China
In the minimal supersymmetric standard model (MSSM) with complex parameters, supersymmetric loop effects can lead to CP violation. We calculate the rate asymmetries of decays of charginos into the lightest neutralino and a W boson on the basis of the most important loop contributions in the third generation squark sector. It turns out that the CP violating asymmetries can be a few percent in typical regions of the parameter space of the MSSM. These processes would provide very promising channels for probing CP violation in the MSSM at future high-energy colliders.