The conducting polypyrrole (PPy) nanofilms have been in-situ polymerized on quartz substrates under various high reaction pressures (0.1–60002MPa). The effects of the applied pressure on films have been carefully investigated through UV-Vis, FT-IR, SEM, AFM and conductivity measurement. The effect of the applied pressure on the thickness and the electrical conductivity of the PPy films have been discussed. A three-dimensional relationship between film thickness, reaction pressure, and the conductivity of the films has also been described in text. Our results may provide a guide for studying in-situ polymerization of pyrrole and its derivatives under high reaction pressure.