In order to find more effective radioprotector, an improved new method to synthesis sinapic acid and its amine salt derivatives has been reported, and the study of ESR spectra from sinapic acid-dTMP with molar ratio 1:10 irradiated and recorded at 77 K has confirmed the long range electron transfer from thymine of dTMP to sinapic acid:,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42648498&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42648500&type=,http://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=42648509&type=,also, the radioprotective effect of sinapic acid amine salt derivatives on irradiated mice(500 rad.) has been shown in increasing peripheral platelet count with significance of statistics. The I. R and NMR spectra of sinapic acid derivatives also have been reported.