The evolution course of potassium-filled pores during the production and annealing of tungsten wire was observed systemat-ically by SEM and TEM, and the basic parameters of potassium-filled bubble rows also were measured statistically in this work.The results showed that based on disturbance theory and diffusion theory, the analyses of shape unstability of tube-shaped sec-ond phases or pores, which exist in metallic matrix, are basically suitable for the potassium-filled tubes in doped tungsten. Ac-cording to the observations, analyses and calculations, the breakup models of long and thin potassium-filled tubes andring-shaped potassium-filled bubbles, which are the basic models for the dispersion of potassium-filled bubbles, were put for-ward. The relationship between basic parameters of potassium-filled bubble rows and the geometry size of potassium-filled tubesand the condition under which a potassium-filled tube can break up during the annealing of tungsten wire were also derived. The evolution course of potassium-filled pores was the production and annealing of the tungsten wire was observed systemat-ically by SEM and TEM, and the basic parameters of potassium-filled bubble rows also were measured statistically in this work. The results showed that based on disturbance theory and diffusion theory, the analyzes of shape unstability of tube-shaped sec-ond phases or pores, which exist in metallic matrix, are basically suitable for the potassium-filled tubes in doped tungsten. Ac-cording to the observations, analyzes and calculations, the breakup models of long and thin potassium-filled tubes andring-shaped potassium-filled bubbles, which are the basic models for the dispersion of potassium-filled bubbles, were put for-ward. The relationship between basic parameters of potassium-filled bubble rows and the geometry size of potassium-filled tubes and the condition under which a potassium-filled tube can break up during the annealing of tungsten wire were also derived.