In this study, we tried to compare and determine what the effects will be to the sensory characteristics and textures of a meat balls when the proportion of the texturized soy protein (TSP) varies from 0, 10, 20, 30, and 40%. Evaluation was conducted through sensory evaluation and objective evaluation. The results are as follows: 1. As the level of 40% TSP increased the meat ball maintained a better appearance. 2. Color, beef flavor, tenderness, juiciness and acceptability showed the tendency to decrease as TSP proportion increased. (1) No significant change to the outside color revealed to the level of 20%. However, inside color showed a significant change after the level exceeded 20%. (2) Soy flavor tended to increased and beef flavor tended to decrease as the TSP proportion increased. However up to the level of 30% one could not taste the flavor of soy. (3) Tenderness tended to decrease as the TSP proportion increased however difference was not significant. (4) Juiciness decreased as TSP proportion increase. (5) Acceptability tended to decrease as the TSP proportion increased but to a 40% addition, the level of TSP did not have much effect on the sensory characteristics as long as sufficient seasonings were added. 3. Instron measurement incidated that springiness, cohesiveness and shear force tended to decrease as the TSP proportion increased but hardness increased and chewiness was the highest at 20% TSP level. 4. Color and difference meter indicated that the figure L and b tended to increase and ΔE decreased as the TSP proportion increased. 5. Cooking retention tended to increase as the TSP proportion increased. From thiss tudy, we can conclude that the level of up to 40% of TSP in making meat ball did not affect the preference.