We prepared Ag-sheathed Nd system tape by the compression molding powder-in-tube method. Ag sheathed tapes of Nd system superconductors were studied for sample with nominal composition of NdBa₂Cu₃O_y(Nd123). The critical current density of sample apparently depended on the thickness of the tape and temperature gradient, and increased markedly with decreasing the tape thickness. The maximum value of the critical current density of sample reached 2.0×10⁵ A/cm² at 6.7 K in zero magnetic field for a tape with 0.3 mm thickness and 1.1×10⁴A/cm² at 77K in zero magnetic field.