A foot assistive device for improving drop foot gait comprises an assistive device body and an elastic module. The assistive device body comprises a foot support base and a brace. The foot support base is movably connected to the brace. The elastic module connects the foot support base to the brace. The elastic module has a spring, a preset support included angle is formed between the foot support base and the brace under an elastic force of the spring. The support included angle is not larger than 90°. Thereby, when the foot is raised up, the foot support base is unlikely to drop excessively due to the foot weight, the drop foot gait is improved effectively.本創作係提供一種基於彈性部件置換之垂足支架結構，其包含：一本體；一底座，具有一底板及一組接座，組接座係樞設於本體；一彈性部件，其係活動設置於該本體及該底座之間，該彈性部件設有至少一彈性單元，且該彈性部件係藉由所述彈性單元之彈性力以令該底座之底板與該本體間之夾角非大於90度；藉此，本創作係可依使用者之需求，如：垂足情形、足部之重量，而予以更換相異彈性力之彈性部件，進而調整彈性部件控制該底座之支撐力，藉以抵抗垂足，使降低垂足患者足部之負擔，並改善因中樞或週邊神經損傷後之垂足步態，以利於垂足患者進行足部之活動者。
