Abstract: In order to further understand the expression characteristics and functions of HafabZgene in sunflower,the bioinformatics and expression pattern of HafabZencoded protein in sunflower were analyzed by database retrieval（NCBI）and fluorescence quantitative PCR.The results showed that the protein was predicted to be acidic and hydrophilic,and its secondary structure was mainly irregular curl;phylogenetic analysis showed that HafabZhad the closest evolutionary relationship with Mikania micrantha L.fabZ,and the sequence similarity was 83%.The results of HafabZgene expression analysis showed that the order of HafabZ expression from high to low was seed＞tongue floret＞tube floret＞leaf＞stem＞root on the 7 th day after flowering of sunflower“L-1-OL-1”.At different stages of seed development,the expression levels of HafabZin high and low oleic acid sunflower materials were higher at the early stage of seed development,and reached the highest level at 17 days after anthesis,and then decreased significantly.At 22 and 27 days after anthesis,the expression levels of HafabZin high oleic acid sunflower materials were significantly lower than that in low oleic acid sunflower materials.These results suggest that there may be different regulation mechanisms of HafabZ expression in high and low oleic acid sunflower seeds during this developmental period.