ATP synthase catalyzes the synthesis of energy substance ATP and plays an important role in plant growth and stress tolerance. Functional studies of DoVHAb2 in yam tuber starch metabolism and salinity tolerance have so far not been reported.This study aimed to provide evidence for the role of DoVHAb2 in yam tuber starch metabolism and salinity tolerance. Full-length cloning and analysis of DoVHAb2 were conducted to ascertain its function. The gDNAs were cloned and structures were analyzed. Quantitative realtime polymerase chain reaction (qRT-PCR) was used to investigate the yam tuber developmental stage and different organs of DoVHAb2. Transient expression vector was constructed and injected into tobacco leaves to observe the subcellular localization of genes. overexpressed fusion vector of gene was constructed and transformed into tobacco by Agrobacterium-mediated method to identify the function of DoVHAb2 gene. The full-length of DoVHAb2 was 1926 bp, encoding 488 amino acids, and it was divided into 14 exons and 15 introns. Highest expression of DoVHAb2 was found in tubers than in stems and leaves in yam. That yam DoVHAb2 protein was localized to cytoplasm. Starch content, ADP glucose pyrophosphorylase, starch synthase and ATPase activity were significantly higher in transgenic tobacco plants than in the wild-type. The transgenic plants also had higher leaf differentiation rate, soluble protein content, superoxide dismutase and peroxidase activities, and lower malondialdehyde content than the wild type under NaCl stress. The results indicated that overexpression of DoVHAb2 enhanced starch metabolism and conferred salinity tolerance.