  The chiral doublets for nuclei in $A\sim100$ and $A\sim130$ regions have been
studied with the particle-rotor model. The experimental spectra of chiral
partners bands for four N=75 isotones in $A\sim130$ region have been well
reproduced by the calculation with the configuration $\pi h_{11/2}\otimes\nu
h_{11/2}^{-1}$. The possible chiral doublets in $A\sim100$ region have been
predicted by the PRM model with the configuration $\pi g_{9/2}\otimes\nu
g_{9/2}^{-1}$ based on the analysis of the spectra, the $\omega$-I relation,
the $B(M1)$ and $B(E2)$ transition probabilities, and the structure of the wave
functions. The possible chiral doublets for nuclei with asymmetric particle and
hole configuration are also discussed.
