Wetting behavior of microliquid drop on a geometrical complex substrate is analyzed quantitatively. In order to analyze pinning effect in liquid spreading, the array of isolated square patterns is formed by the photolithography. The square patterns on flat substrate are composed with the combination of higher and lower surface energy materials. Two types of complex substrates, isolated polar and continuous polar patterns, are fabricated. The test liquids, de-ionized water, ethylene glycol and diiodomethane, are sessile dropped oil the complex substrate. Particularly, the isolated polar pattern acts to pin the polar liquid spreading. The combination of a polar liquid and an isolated polar substrate has strong interaction on each other. However, in the case of the continuous polar pattern. the wetting behavior of liquid drop can be explained due to Cassie's equation. The contribution of the polar material to the wetting property on geometrical complex substrate can be clarified. (C) 2004 American Vacuum Society.