In Nanchang area with widespread and thick Quaternary alluvia, two kinds of neotectonism are clearly identified by remote sensing. Vertical up-and -down makes Gan river and Fu river transfer from west to east, while horizontal drift causes extension and open of Qinlan lake and Junshan lake. The two kinds of neotectonism have trigged rockfalls of lake and river banks which should attract attention of the government.