Objective To determine the content of ginkgolic acids in ginkgo nuts for providing a reference in the development of quality standards for ginkgolic products.Method Ultrasonic extraction was used from ginkgolic nuts and the content of ginkgolic acids was analysed by HPLC.Results The highest content of ginkgolic acids in germ was 64.415 μg/g,followed by the content within the endopleura was 16.030 μg/g,5.277 μg/g in mesosperm,0.103 μg/g in endosperm.Conclusion C13∶0、C15∶1,C17:2,C15∶0 and C17:1 are all in mes...