The automatic determination of the total rare earths in the aluminium-rare earth alloys was studied by using our recently designed automated flow injection device and the high sensitive and selective rare earth reagent-DBC-CPA (2 -(2-phosphono-4-chlorophen-ylazo)-7-(2,,6-dibromo-4-chlorophenylazo)-1,8-dihydroxy-3, 6 - dis-ulfonaphthalene). The automated flow injection device consists of an Apple Ⅱ microcomputer, two peristaltic pumps and a spectrophoto-meter. It has good automatic degree and high producibility, the sampling volume and rotation velocity of the pumps can be changed continuously and automatically. The total rare earths in aluminium-rare earth alloys were automatically determined at 645nm wavelength in the medium of 1.Omol/L HC1 and 1% H2C2O4 . Fe Cu, Al, Mg, Ni, Zn and Cr don’t interfere with the determination and temperature has no effect on the sensitivity in the range of 10-49℃ above zero. The calibration curves for cerium group and yttrium group rare earths are close to each other. T The automatic determination of the total rare earths in the aluminum-rare earth alloys was studied by using our recently designed automated flow injection device and the high sensitive and selective rare earth reagent-DBC-CPA (2 - (2-phosphono-4-chlorophen -ylazo) -7- (2,6-dibromo-4-chlorophenylazo) -1,8-dihydroxy-3,6-dislfluorophthalene). The automated flow injection device consists of an Apple II microcomputer, two peristaltic pumps and It has good automatic degree and high producibility, the sampling volume and rotation velocity of the pumps can be changed continuously and automatically. The total rare earths in aluminum-rare earth alloys were automatically determined at 645 nm wavelength in the medium of 1.Omol / L HC1 and 1% H2C2O4. Fe Cu, Al, Mg, Ni, Zn and Cr do not interfere with the determination and temperature has no effect on the sensitivity in the range of 10-49 ° C above zero. calibration curves for cerium group and yttrium group rare earths are cl ose to each other. T