Abstract: A smart flexile smart curtain film is disclosed, a light transparency for the smart curtain film can be adjusted according to a voltage applied thereon. One of the embodiment shows that the smart curtain film is designed normal dark, and the transparency is related to the voltage applied. The greater voltage is applied the more transparent the smart curtain film displays. The smart curtain film is adaptive to be attached onto a surface of a window glass to form a smart window glass. During daytime, a person can adjust the transparency of the smart curtain to block some light beams from entering the room; and vice versa, during nighttime, a person can adjust the transparency of the smart curtain to block some light beams from exiting the room to keep one's privacy.