In this work, we present results of synthesis, electric and structural characterization of Ruddlesden- Popper Lan+1Nin-xZnxO3n+1(n =1, 0<x<0.4) compounds. The samples were synthesized by combustion reaction method by using citric acid as fuel. The precursors obtained from this reaction were treated for 12 hours at 1100 °C in air. The polycrystalline samples were characterized by X-ray diffraction (XRD) and electric resistivity. The XRD results indicate that samples were obtained with single phase in the orthorhombic symmetry and space group I4/mmm. The preliminary results suggest that the Zn-doping plays an important role on the charge transport and modifies the manner that the holes are arranged in the system.