Using the PECVD (Plasma-enhanced chemical vapor deposition) method the microcrystalline silicon thin films were deposited on common glass substrates. Raman scattering spectra and AFM(atomic force microscopy) were used to analyze the crystalline condition of the films and the experimental results. The results show that when the temperature changed from 200℃ to 400℃ or the dilution changed from 95%-99% films would change from amorphous to poly-crystalline. When the power was too low or too great the crystalli...