This study was carried out in order to get pistachio cultivars registration of the commercial and native pistachio in the provinces Kerman ('Owhadi', 'Kalleh Ghoochi', 'Ahmdaghaei', 'Akbari', 'Momtaz', and 'Fandoghi 48'), Semnan ('Abasali' and 'Shahpasand'), Ghazvin ('Kaleh Bozi') and Khorasan Razavi ('Badami Sefid'). Evaluation of morphological traits based on national tests and international Descriptors' List was performed. The results showed that the following factors are distinct and exclusive: growth habit, changing of shell color and shape of fruit top for 'Shahpasand' cultivar; trunk color, color of one-year-old shoot, early splitting, seed width, weight of 100 seeds, seed thickness and terminal leaflet margin for 'Kalleh Bozi' cultivar; the terminal leaflet shape for 'Owhadi' and 'Abasali' cultivars; the terminal leaflets top figure for 'Kaleh Ghoochi' cultivar; the section width of petiole, inflorescence density and hull strength for 'Abasali' cultivar; inflorescence axis length, flowering period and loosing fruit from the cluster for 'Fandoghi 48' cultivar; opening time of 50% of the flowers and the first flowering stage after grafting for 'Akbari' cultivar; the shape of flower bud and depression near the junction of fruit for 'Momtaz' cultivar; the hull color for 'Ahmdaghaei' cultivar; color of fruit junction area for 'Abasali' and 'Fandoghi 48' cultivars; position of shell splitting, blank seed percentage, color of kernel skin and flowering time for 'Badami Sefid' cultivar. Study on the coefficient of similarity showed that 'Ahmadaghaei' and 'Akbari' cultivars had the highest similarity in terms of quality characters and 'Ahmadghaei' with 'Kalleh Ghoochi' and 'Kalleh Bozi' with 'Ahmadaghaei' had the lowest similarity. Furthermore, cultivars in the region of Damghan ('Abasali' and 'Shahpasand') grouped in one and 'Kalleh Ghoochi' and 'Owhadi 'cultivars grouped in two separate groups. Grouping exclusive traits and all cultivars were registered by using these characteristics and statistical analysis.