Abstract: The n-type and p-type Cu₂O films were prepared with hydrothermal method and p-type Cu₂O films were prepared with electrochemical method. With X-ray diffraction（XRD），scanning electron microscopy（SEM）and other tests，these p-type Cu₂O thin films were characterized and studied in photoelectric properties. The experimental results showed that：in weak acid solution，the conductivitive Cu₂O films prepared by hydrothermal were n-type，in alkaline solution，the films were p-type；while the conductivitive Cu₂O films prepared by electrochemical method were p-type which were cubic crystal.

Key words: nano-cuprous oxide film, hydrothermal method, electrochemical method, photoelectric properties