In this study,all KNN-LST sample were produced by solid-state reaction method.The optimum sintering temperture is 1130c for 4 h.KNN-LST ceramic repersent orthorhombic mixture tetrahedral phase.The density increase when increasing sintering temperture that at 1130 dinsity is 4.44 g,grain size is 2.274 m that is the highest density. The KNN-LST was found to be the best it showed maximum d33 is 147 n and dielectric constant is 490.959,low dielectric loss.And data from P-E loop at 1130c has e is 12 kv and P,is 11.69 cm