Objective To explore the impact of community healthcare workers’ (CHWs) knowledge, attitude and practice (KAP) on the influenza vaccination among elderly people. Methods By means of simple random sampling, 1 residential quarter of each communities, 2 communities of each districts, 5 districts of Chengdu city were randomly selected, and the elderly equal to or more than 60-year-old were on-site investigated. Meanwhile, the questionnaire survey was conducted among healthcare workers in the selected communities. Results There were 4 KAP factors played a positive role in influenza vaccination among elderly people: CHWs’ affirmation of the effectiveness of influenza vaccine, explicitly knowing the focus groups for influenza vaccination, recommendation of vaccination in flu season when the elderly visits, and participation in flu-related education activities. When the accuracy rate of each factor got improved by 1%, the influenza vaccination rate would improve by 2.747%, 1.299%, 0.864%, 0.602%, respectively. Conclusion The knowledge, attitude and practice of HCWs have impacts on the influenza vaccination rates of elderly people. They are significant to improve the influenza vaccination rates of the elderly.