A technique for the measurement of diffuse X‐ray scattering by a combination of an energy‐dispersive detector and a source of white X‐rays is described by taking the instrumental resolution into account. A high‐power X‐ray generator was used to generate white X‐rays. The short‐range‐order (SRO) diffuse scattering from Au4Mn alloy was measured and the Warren–Cowley SRO parameters of this alloy were determined up to the 50th shell. The results are in good agreement with those obtained by the angle‐dispersive technique. Possible application of this method with the use of X‐rays from a synchrotron radiatio