Objective? To explore the application effect of online learning platform on the training of family caregivers of disabled elderly people. Methods? From September 2017 to March 2018, the family caregivers of 90 disabled elderly people in a district of Changsha were selected by convenience sampling method, and divided into control group and observation group by random number table method, with 45 cases in each group. During the study period, the caregivers of the control group received general health education. The caregivers in the intervention group received online training on the self-developed online learning platform under the guidance of the researchers for months. Before and after the training, the family caregivers were investigated using the Family Caregivers Care Ability Scale and the Care Knowledge Assessment Questionnaire. Results? Before the training, there was no statistically significant difference in average score of care knowledge, and the total score and the five dimensions' scores of the Family Caregivers Care Ability Scale between the two groups (P ＞ 0.05). After training, the score of the care knowledge in the intervention group was (82.2±15.2), which was higher than that in the control group (64.2±17.2), and the difference was statistically significant (t=5.260,P＜ 0.01). After training, the score of Family Caregivers Care Ability Scale in the intervention group was (13.90±4.52), which was lower than that in the control group (16.57±3.25), and the difference was statistically significant (t=3.217,P＜ 0.01). The scores of the four dimension of the scale, including adjusting the role of caregiver, meeting need and providing assistance, dealing with personal mood, adjusting life in order to meet the needs to take care of elderly in the intervention gorup were lower than those in the control group, and the differences were statistically significant (P＜ 0.05). Conclusions? The training based on the online care knowledge and skill system for disability elderly can improve the family caregivers of nursing knowledge level and ability to take care of the elderly.