Low temperature magnetic measurements have been made on pseudoternary compounds Nd2(Fe1-xRux)14B, in order to study the compositional variation of. the spin reorientation phenomena with the Ru concentration parameter x. The spin reorientation temperature (Tsr) decreases from 136 K for ternary Nd2Fe14B to 92 K for Nd2(Fe0.9Ru0.1)14B and to 78 K for Nd2(Fe0.8Ru0.2)14B. The extrapolated 0 K tilting angle decreases form 30° at x = 0.0 to 16° at x = 0.2. No Nd2Fe14B-type structure can be observed with Ru parameter x larger than 0.25.