The Iranian carpets, relative to clime and culture of the productive societies, have accepted various visual and technical characters. Scientific and Methodological study of this character and their formative principles is one of the permanent debates among researchers. The main issue of this research is to consider the diversity and individuality of research and analyze methods in carpet studies. This pluralism has caused some problems such as evaluation and confirmation of research data. According to capability of stylistic knowledge at study and typology of art species, researchers continually have asserted the necessity of stylistic knowledge’s utilization for carpet studying’s. The first aim of the study is terminological redefinition of stylistic knowledge’s concepts related to handmade carpet characters and the second aim is offering a scientific methodology to stylistic researches on carpet designs and motifs. By paying attention that recognition of stylistic elements and their evolution are the main axis of stylistic studies, the questions of this research are concentrated on, 1-recognition of specific concepts of stylistic keywords in carpetology, 2-the process of methodological research on carpet designs and motifs from a stylistic point of view, 3-recognition of affective factors in evaluation of carpet designing styles. Results have shown, specific concepts and terminology of stylistic knowledge have the capability of adapting with different aspects of carpet designs and motifs. Thus the methodology of stylistic knowledge and its various approaches can be used for stylistic designinng of carpets or recognition of affective factors in the appearance or the decadence of various designing styles. This study is done using of library sources and field experiences and methodologically it has used descriptive - analytical method.