Introduction 3.Model of Domestic Automobile and Tractor 3.1 Model of automobile It consists of3 parts:the header,middle,tail component. header middle tail Special automobile catalog number and enterprise code, front part is alphabet,rear is alphabet or number. Serial number,is denoted by one arabic numeral, usually refers to improved serial number. Main feature parameter code,denoted by two arabic numerals. Category code,is denoted by one arabic numeral Enterprise name code,denoted by 2~3 Chinese pinyin alphabets. 场机被与电子工程学保 Automobile and Tractor Northwest A&F UniversityAutomobile and Tractor Northwest A&F University Introduction 3. Model of Domestic Automobile and Tractor 3.1 Model of automobile It consists of 3 parts: the header, middle, tail component. header middle tail Special automobile catalog number and enterprise code, front part is alphabet， rear is alphabet or number. Serial number，is denoted by one arabic numeral, usually refers to improved serial number. Main feature parameter code， denoted by two arabic numerals. Category code, is denoted by one arabic numeral. Enterprise name code， denoted by 2~3 Chinese pinyin alphabets