1.8± 1.3 cm at P2. In the condition UCon, the COG of all subjects displaced to dominant side at both postures. The hip joint angular velocity of Con was significantly higher than that of UCon in both postures (p< 0.01). Moreover, the jerk cost on an anteroposterior direction and the right and left direction was significantly larger Con than UCon in both postures (p< 0.01). The jerk cost on vertical direction was not significantly difference between Con and UCon in both postures. Conclusion(s): The energy cost influenced the formation of COG trajectory during sit-to-stand motion with asymmetrical foot placement. Implications: Rising from chair in asymmetrical foot placement is useful treatment for involved lower extremity of stroke patients. The results of this study gave the evidence of the treatment.