To improve the detection efficiency, a new method for the determination of 7 N-nitrosamines in ready-to-eat fish products was developed by GC-MS/MS with alkali treatment coupled salt-assisted dispersive liquid-liquid microextraction (SADLLME). The sample was heated with barium hydroxide solution to transfer N-nitrosamines into the water based solution. Then SADLLME was carried out with dichloromethane as extractant and nearly saturated sodium sulfate as assisted salt, and the analytes extracted were determination by GC-MS/MS. The limits of detection and limits of quantitation were 0.10-0.19μg/kg and 0.28-0.56μg/kg, respectively. The recoveries were 79.19%-117.40% with relative standard deviations of 1.06%-10.30% at 1,5 and 10μg/kg spiking levels. The results showed that the method was sensitive,reliable and good selective with simple sample pretreatment and it could meet the needs of monitoring of N-nitrosamines in related foods.