Small angle neutron scattering (SANS) measurements have been carried out over a wide range of Q from 0.003 to 7 Angstrom(-1) on the 1-propanol-water solution with KCl and that without KCl in relation to the salt-induced reentrant phase-separation phenomena. The Q dependence of the SANS intensity for both solutions is characterized by the same fractal structure with the fractal dimension d(f) of 1.9. The only difference between the two solutions is the value of correlation length xi. In the solution without KCl the value of xi is rather small, ranging from 7.4 to 6.2 Angstrom depending on temperature, while in the solution with KCl it becomes very large, from 48 to 355 Angstrom or more depending on temperature, and diverges toward the phase-separation temperatures in a similar way for both the upper and lower one-phase regions. No significant differences have been found on the growing structure of fluctuation in the upper and lower one-phase regions.