  In this paper, we give a unified construction of two-parameter quantum groups
$U_{r,s}(\mathfrak{g})$, two-parameter Kashiwara algebras
$B_{r,s}(\mathfrak{g})$, two-parameter quantized Weyl algebras
$W_{r,s}(\mathfrak{g})$ and the action of $U_{r,s}(\mathfrak{g})$ on
$B_{r,s}(\mathfrak{g})$ and $W_{r,s}(\mathfrak{g})$. Applying their properties
to the category $\mathcal{O}(B_{r,s}(\mathfrak{g}))$, whose objects are "upper
bounded" $B_{r,s}(\mathfrak{g})$-modules, We can give a conceptual proof of its
semi-simplicity and the classification of simple modules in it.
