Abstract: Electrical resistivity for individual solids is generally a complicated function of temperature. There has been no report on a constant electrical resistivity in a sizalle temperature range observed in any single solid, and the constant resistance demanded for many applications has been realized only through structure designs or circuits. In the composition-modulated Cu3NPdx which undergoes semiconducting-to-semimetallic transition, a nearly vanishing temperature coefficient of resistance was measured in a temperature range over 240 K in Cu3NPd0.238. This, to the least, demonstrates the possibility of constant resistivity in a single solid, thus is of significance for both the understanding of solid-state physics and applications.