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The formation of mature mRNA requires cutting introns and splicing exons. The occurrence of splicing involves the participation of the spliceosome. Common spliceosomes mainly include five snRNPs: U1, U2, U4/U6, and U5. <i>SF3a2</i>, an essential component of spliceosome U2 snRNP, participates in splicing a series of genes. There is no definition of <i>SF3a2</i> in plants. The paper elaborated on <i>SF3a2s</i> from a series of plants through protein sequence similarity. We constructed the evolutionary relationship of <i>SF3a2s</i> in plants. Moreover, we analyzed the similarities and differences in gene structure, protein structure, the cis-element of the promoter, and expression pattern; we predicted their interacting proteins and constructed their collinearity. We have preliminarily analyzed <i>SF3a2s</i> in plants and clarified the evolutionary relationship between different species; these studies can better serve for in-depth research on the members of the spliceosome in plants.