A novel nonlinear optical polymer (P1) containing tricyanofuran units is synthesized by Friedel-Crafts reaction. The polymeric films are then fabricated by means of the spin-coating method, and the alignment of the chromophores of the polymeric film is carried out by corona poling method. The poling behaviors of the films are studied by UV-visible absorption spectra and atomic-force microscopy (AFM). From the absorbance change, the order parameter (Φ=0.20) of the poled film can be estimated. The second-order nonlinear optical properties of the polymer are measured by the second harmonic generation (SHG), and the obtained value of the second harmonic coefficient d33=9.4 pm/V. The sample is stored at room temperature for 2 d, and the value of d33 is remained at 70% of the initial value. The experimental results show that compared with the host-guest adulterant polymer, P1 possesses competitive optical nonlinear stability.