Inclusion complexation between veronicafolin, 3,5,4′-trihydroxy-6,7,3′-trimethoxyflavone, and β-cyclodextrin (β-CD) was investigated by using ¹H NMR, IR, X-ray diffraction, thermo gravimetric analysis (TGA), and elemental analysis in the solid state. The elemental analysis showed that the complex (1:1) of flavonol-β-CD·20H₂O with C 39.58% and H 5.75% has been formed. The phase solubility profile of the favonol by UV-Vis in solution in the presence of hydroxypfropyl-β-cyclodextrin (HP-β-CD) was classified as A_L-type, indicating the formation of 1:1 inclusion complex. And the calibration equation y=24148x+0.0075 (r=0.9999) and phase-solubility diagram y=0.4738x-2.0×10^-7 (r=0.9490) were obtained. Stability constant K_s was calculated from the phase solubility diagram (K_s=4.5×10⁶). Solubility of the veronicafolin was enhanced in the presence of HP-β-CD.