The purpose of this study was to identify the characteristics of trunk muscle strength and weight bearing of lower extremity in the 16 adult hemiplegia. Following a stroke, one of the most commonly noted impairments is a more affected weakness. Although many investigations have addressed the weakness that accompanies a stroke, most of them have focused on the limb muscles. Given the role of the trunk muscles during sitting and the importance of sitting as a predictor of outcome following a stroke, the information on trunk muscle strength following the brain lesions is needed. The forward and lateral trunk muscle strength was measured by NICHOLAS manual muscle tester while subjects were seated upright. The weight bearing and weight shifting was measured with portable weigher in sitting and standing. The result shows that the muscle strength of the affected side is bigger than the non-affected side. As the subjects bend their upper trunk more forward while sitting, the affected and non-affected side shows the more significant difference on weight bearing. Also, the weight bearing and weight shifting are greater on the affected side than non-affected side. It can also be analyzed that the lesser the difference between the muscle strength of the affected side and the non-affected side, the closer the weight bearing and weight shifting ability of the affected side and the non-affected side.