Abstract: One special solvents purifying device was developed for analysis of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs).The purifying effect of the device was evaluated by high resolution gas chromatography and high resolution mass spectrum(HRGC-HRMS)with femto gram level analytical technique.The results showed that no PCDD/Fs and interferential materials were detected(i.e.below detection limit 10-15 g)in the analytically pure solvents such as toluene,hexane,dichloromethane and acetone.The device is small in size and flexible in operation,can meet with the ultra-high purity requirements of PCDD/Fs agent for laboratory use,and can greatly decrease the research cost of PCDD/Fs.