  The positive parity doublet bands based on the $\pi h_{11/2}\otimes\nu
h_{11/2}$ configuration in $^{126}$Cs have been investigated in the two
quasi-particles coupled with a triaxial rotor model. The energy spectra $E(I)$,
energy staggering parameter $S(I)=[E(I)-E(I-1)]/2I$, $B(M1)$ and $B(E2)$
values, intraband $B(M1)/B(E2)$ ratios,
$B(M1)_{\textrm{in}}/B(M1)_{\textrm{out}}$ ratios, and orientation of the
angular momentum for the rotor as well as the valence proton and neutron are
calculated. After including the pairing correlation, good agreement has been
obtained between the calculated results and the data available, which supports
the interpretation of this positive parity doublet bands as chiral bands.
