This paper reports that the barium sodium niobate (BNN) optical-waveguide film with orientation [110] has been epitaxially grown on the (100) plane of substrate KTiOPO4(KTP) by pulsed laser deposition (PLD). The measurements of XRD, SEM and XPS show that the as- grown BNN film is epitaxial single crystal with smooth surface. The measurements of optical-waveguide mode and propagation loss indicate that the film is of good optical waveguide properties with low loss.