The feeding-sample system used by microwave plasma torch atomic emission spectroscopy(MPT-AES)is the pneumatic nebulization system;its efficiency,however,is not good.A newly built injector pump-ultrasonic nebulizer combination feeding-sample system has been designed.Its performance was tested and compared with that of the pneumatic nebulization system.It can be concluded that the newly built feeding-sample system can increase the spectral line intensity by about two to three times and decrease the detection limit by about 2 to 10 times.Moreover,this newly built system can reduce the time taken washing the sample cell from 30 rain or so to about 10 rain.