  The effect of Pr substitution on the superconductivity and interlayer
coupling of Bi2212 system is investigated. Magnetic and transport measurements
were performed for purposes of characterization. The superconducting transition
temperature Tc first increased and then decreased till it became zero at x=0.6.
The effective superconducting volume also decreases due to Pr substitution.
  From the fluctuation conductivity analyses it is found that the interlayer
coupling constant J decreases monotonically with increase of the Pr content.
This result shows that the Pr doping weakens the CuO2 interlayer coupling of
Bi2212 system due to the loss of local superconductivity in the CuO2 layers.
