  Within the kinetic energy driven superconducting mechanism, the effect of the
pressure on superconductivity in doped two-leg ladder cuprates is studied. It
is shown that the superconducting transition temperature in doped two-leg
ladder cuprate superconductors increases with increasing pressure in the
underpressure regime, and reaches a maximum in the optimal pressure, then
decreases in the overpressure regime. This domed shape of the pressure
dependence of the superconducting transition temperature is similar to that of
the pressure dependence of the longitudinal part of the superconducting gap
parameter, indicating that superconductivity in doped two-leg ladder cuprates
is mainly produced by the development of the pairing correlation along legs.
