Our aim was to find influence of particleboard surface on adhesion of decorative paper. We compared non-sanded and sanded particleboards. We used 3-layer particleboard (18 mm thick) and white impregnated decorative paper (70g/m2). 5 non-sanded and 5 sanded particleboards were pressed on a laboratory press. Raw non-sanded and sanded particleboards were also analysed. It was found out that moisture and high temperature in the pressing phase have influence on particleboard surface. Using FT-IR spectroscopy we found out that the largest chemical changes are on wave range from 1155 cm-1 to 1731 cm-1, having influence on contact angle and pH value. The non-sanded particleboard had contact angle of water around 90°, and the sanded one around 50°. Measurements of pH value showed that pH value changes after few days. Surfaced paricleboards were tested on surface hardness, the degree of hardening, resistance of steam and resistance of stain. It was found out that the upper side of both types of particleboards is better than lower, except in the case of hardening degree. The results show that non-sanded particleboards are better than sanded ones.