A method for enhancing the therapeutic effect of stem cells on autoimmune diseases, cardiovascular diseases, and/or hematological diseases is provided. The method comprises pre-treating the stem cells with ligustilide to increase the expression of differentiation-promoting genes in the stem cells, increase the expression of homing-promoting genes in the stem cells, and/or decrease the expression of inflammatory genes in the stem cells, wherein the treatment is conducted in a culture medium of the stem cell.