Let X-i,X-n,(m,k,) i = 1 ,..., n are n generalized order statistics (gos) based on an absolutely continuous distribution function F. Suppose that phi(x) is an absolutely continuous and monotonically increasing function in (a, b), - infinity <= a < b <= infinity, with finite phi(a(+)), phi(b(-)) and E(phi(X)). We give characterization of distributions based on the regression of linear combinations of gos. Using our results can obtain characterizations of some distributions.