Uses of n-butylidenephthalide (BP) in dopaminergic progenitor cell transplantation are provided, wherein the uses include using BP to enhance the therapeutic effect of dopaminergic progenitor cell transplantation, and using a combination of BP and BP-treated dopaminergic progenitor cells in dopaminergic progenitor cell transplantation. The uses especially relate to using BP to enhance the therapeutic effect of dopaminergic progenitor cell transplantation on Parkinson's disease.