Objective To translate the Dementia Carer Assessment of Support Needs Tool (DeCANT) into Chinese and test its reliability and validity, and to provide a reference for accurately assessing the support needs of caregivers for elderly people with dementia. Methods The DeCANT was translated, back-translated and culturally moderated using the Beaton translation model to form the Chinese version of the DeCANT (Chi-DeCANT). A convenience sampling method was used to survey 411 caregivers of dementia patients in 19 communities in Wuhan, Hubei Province, and Zhengzhou, Henan Provincefrom October 2023 to August 2024 to evaluate the reliability and validity of the Chi-DeCANT. Results The Chi-DeCANT includes 4 dimensions:support needs for caring the old people, support needs for staying healthy, support needs for caring for themselves, and support needs of the social environment, with a total of 25 items. Exploratory factor analysis extracted 4 commom factors, with a cumulative variance contribution rate of 68.305%. Confirmatory factor analysis showed that χ2/df=1.236, RMSEA=0.033, GFI=0.898, AGFI=0.877, NFI=0.908, RFI=0.898, IFI=0.981, TLI=0.979, and CFI=0.981. Content validity indexes of the scale at the item level were 0.833 to 1.000, and the content validity index at the scale level was 0.980. The Cronbach′s α coefficient for the scale was 0.952, the split-half reliability was 0.855, and the retest reliability was 0.964. Conclusion The Chi-DeCANT has good reliability and validity and can be used as a valid tool to assess the support needs of dementia caregivers.