The phrases“Sa Zi”and“Sa Zi ＋ N”are frequently used in colloquial language of the Sichuan dialect. However, as for the pronunciation of the character“Sa”, its Chinese phonetic versions vary from book to book. In the Sichuan dialect, phrases like“Sa Zi”,“Sa Zi Dong Xi”are generally adopted for asking objects and“Sa Zi”,“Sa Zi Shi”can pose questions on events. These three structure forms exist simultaneously, embodying common ground and reserving differences at the same time. This thesis, based on dialectical colloquial speech corpus as well as dialectical textual form corpus, conducts a research between the phrases“Sa Zi”and“Sa Zi ＋ N”to fully investigate both similarities and differences in semantic expression and syntactic functions from the perspectives of synchronic linguistics.