Structure,magnetic and transport properties of polycrystalline Nd0.5S r0.4Pb0.1MnO3 were experimentally studied by ne utron powder diffraction at room temperature and magnetic measurement.The neutron diffraction shows that the space group of this orthorhombic structure is Pnma,i.e.its structure exhibits crystal field distortion.Its Curie temperature TC equals 273K by the M-T curve.According to the R-T curve,it shows a ferromagnetic metal- paramagnetic semiconductor transition as temperature increases and Tp =225 K.Using the competing between manganites crystal field and double exchange inter action explains the metal property at room temperature.