Анотация: Posavje horse is an autochthonous horse breed in Slovenia as well as in Croatia. Slovenian population of Posavje horse is traditionally reared in the lower flow of the river Sava, in the surroundings of Krsko and Brezice. Breeding program for the Posavje horse was accepted in the year 2005 when the Slovenian Association of Posavje Horse Breeders was established, too. The aim of the study was to analyse the conformation and gait traits of the Slovenian population of Posavje horse. Likewise, we tried to evaluate the most known fixed effects, affecting the included traits. Data were collected during the classifications of Posavje horse, performed in the years 2000 to 2011 and evaluated by only one expert. In this study 557 horses were included, among them 44 stallions and 513 mares, born during the years 1999 to 2007. The scoring system included 9 measured and 11 scored traits. Data were analysed by GLM procedure of statistical package SAS/STAT considering sex, age at scoring and birth year as fixed effects