In my graduation thesis we have been establishing how the concetracion of phenolic compounds is affecting the antioxidative potential of red wines of Dolenjska. We have been analysing six samples of four different wines such as Blue Frankish, Žametovka, Zweigelt and Cviček PTP. We have been using method of Singleton and Rossi for determing concentration of phenolic compounds and method for determing antioxidative potential by using DPPH˙ free radical. Finally we have used WineScan method to study how three months long maturing is affecting chemical properties of wine. We have established that by increasing of concentration of phenolic compounds so does increase antioxidative potential of wine, which is not only affected by concentration but also by characteristics of phenolic composition, what can be seen in case of samples of Žametovka. We have also observed that by three months of maturing the concentration of phenols is slightly decreasing. Concentration of alcohol and pH are not changing by time, while concentration of reduced sugars is decreasing. For most samples concentration of volatile acids is not changing or is slightly increasing, while sample 2 of Blue Frankish shows a bit higher values.