In this paper, Ion strength conditioning system which can control a rheological property of Polymeric electrolyte solution is reported. Polyelectrolytes dissociate in aqueous solutions, making the polymers charged. The rheological properties of polyelectrolyte solutions are strongly affected by counter ion concentration. The newly developed Ion strength conditioning system consists of a colloidal particle in water providing hydrogen ions to the target solution, a membrane filter which separates the target solution and the colloidal dispersion, and electrode. In the experiment, the viscosity of a PAANa 200ppm solution treated with the ionic strength conditioner was measured by capillary rheometer. As a result, we can see a reduction of a viscosity for a supply of the hydrogen ions by the conditioner. And further more, we can increase the viscosity of the solution by a collection of the hydrogen ions from solution.