Lead-free ferroelectric K(0.5)Na(0.5)NbO(3) (KNN) thick films with improved performances have been successfully prepared by polyvinylpyrrolidone-modified chemical solution deposition method. The KNN thick films were obtained by pyrolyzing at different temperatures and annealing at 600 degrees C. The effect of pyrolysis temperature on structures and electrical properties of KNN thick films is studied. The crystallinity of KNN films decreased with the increasing of the pyrolysis temperature, and the porous morphology is observed in the KNN films pyrolyzed at 480 degrees C. However, the film pyrolyzed at 330 degrees C is dense. With the analysis of X-ray photoelectron spectroscopy for K ions, it was found that a low pyrolysis temperature favors the formation of perovskite KNN phase. Therefore, the electrical properties of the KNN films became improved at the low pyrolysis temperature. The KNN film pyrolyzed at 330 degrees C and annealed at 600 degrees C exhibits the large dielectric constant of 685 and low dielectric loss of 6.95%. The film also shows the saturated and symmetric polarization-electric field (P-E) loops with remnant polarization of 12 mu C/cm(2) and piezoelectric coefficient d(33) of 56 pm/V.