Abstract: The automic analysis during the production line of nickel surfate on plating baths of electroless nickel plating process is given in this paper.Using the principle of continuous flow spectroptometry,the instrument of automic analysis on production line is developed.The regression equation between the nickel surfate concentration and absorbance is abtained through the standard concentration of nickel surfate being determined.The standard deviation of the instrument is less than 2% and the error comparing to the chemistic analystic method is less than 3%.The analytic time only 6 minutes.The instrument completely fits the automic analysis of nickel surfate during electreless nickel plating production line.