Abstract: Content of potassium ion in the Kappa - Carrageenan directly influence on condensation point the strength and diffusion water of Carrageenan gel. The method of Ion - selective electrode companied with special solution can avoid effectively interfereing when measurting and exacttly measure content of potassium ion in the Kappa - Carrageenan rapaidly.

Key words: Kappa - Carrgeenan Ion - selective electrode method of analyse potassium ion