Isoscattering point is the specific point at which X-ray or neutron scattering intensity of solutes is independent of contrast between solutes and solvent. The point has been observed in the X-ray small-angle scattering curves of globular particles such as micelles and bacteriophages. The condition for appearance of the Isoscattering point is briefly summarized and in view of the application to analysis of the solute structures, the nature of the isoscattering point is described in detail.