Abstract: Curve equation fit for prediction of tartrate stability was completed on the principle of least-square.Theequation Z for (%HT-) is in the form of Z=-P(x)y2+Q(x)y-R(x),where x as concentration of ethanol y as pHof wine. Concentration product for [K+]and [HT-] is in the form of CP=Z[K+][Tartrate]/100.The supplementary workon the reftrence data for stability judgment the characteristics of three dimension figure and the application of theequation to the wine production were also presented.

Key words: Wine, Tartaric acid, Stability