Second harmonic generation (SHG) by guided phase matching using anomalous dispersion of poled polymer is investigated in waveguide structure. The second harmonic TM0 guided mode can he generated from the fundamental TM0 guided mode and then the second harmonic power was higher than any other phase matchable mode because the overlap integral between the fundamental and the second harmonic waves is the largest in theoretical analysis. Near UV SHG (370nm) was observed from the fundamental wavelength of Ti-sapphire laser (740nm).