In order to study the construction technology of slurry shield crossing fractured zone under complex geological conditions, based on the tunnel project from Qiushui Square Station to Zhongshanxilu Station on Line No. 1 of Nanchang Metro, the construction difficulties are analyzed for NFM07 slurry shield crossing underneath Ganjiang River at fracture F5. The stability construction technology through the fractured zone under high water pressure is studied in terms of excavation control, slagging amount and slurry quality control, synchronous grouting and secondary grouting. By analyzing the construction records, the recommended parameters of boring, slurry, synchronous grouting and secondary grouting are obtained; and some countermeasures are put forward for potential construction risks. The slurry shield has been successfully passed through the fractured zone, and good stability control effect has been achieved.