The expression levels and changes of endogenous acid fibroblast growth factor (aFGF) in microwave bum wound tissues were detected in order to investigate how to get better therapeutic ef- fects by using the exogenous aFGF for repairing trauma. A bt-wound animal model was estab-lished by NS-FⅡ multifunction spectrum therapeutics equipment, and reverse transcrip-tase-polymerase chain reaction (RT-PCR) and immunohistochemistry assay were applied to detect the expression levels of endogenous aFGF mRNA in microwave bum wound tissues. The expression level of endogenous aFGF mRNA was significantly increased in the bum wound tissues 12 h after bum, reached the peak at 48 h, and gradually deceased 96 h after bum. The expression of endogenous aFGF mRNA after tissue damage was reversible, and its intensity was in accordance with the repair process of tissue damage, suggesting endogenous aFGF may take part in the cell metabolism and pro-liferation, and then promote the repair of the bum wound.