Abstract: Kurşunlu (Ortakent-Koyulhisar-Sivas) Pb-Zn-Cu deposits are the typical examples of the vein styledeposits which are widely seen all over the sounthern and western parts of the Eastern Black Sea region in Turkey.Fluid inclusion studies were carried out on the primary and secondary types inclusions occured in the quartz and sphalarite crystals. These inclusions are very tiny, irregular shaped and two phases inclusions containing liquid and gas phases.Inclusions were divided in four different groups, according their tyapes and mineralagical relations, Their charecteristics are as follows: The first group; primary inclusions in quartz crystals, the second group; primary inclusions insphalarite crystals, the third group; secondary in elusions in the quartz craystals which in contact with the veinlets ofsulfide minerals and/or cut by these veinlets, and the last one; secondary in elusions in the quartz craystals which incontact with the hematite bearing veinlets and/or out by these veintels.First melting temperatures (TF Mp), last ice melting temperatures (TICE) and calculated salinity values in first, thirdand forth group inclusions are slightly different from them.