Chinahasavastlandandalargepopulation.EventhoughtheChineselanguageisspokenalloverthecountry,peopleindifferentareasspeakitindifferentways,whicharecalleddialects.Generallycalledlocallanguages,dialectsarebranchesoftheChineselanguageindifferentregions,andareonlyusedincertainareas.DialectsoftheChineselanguageareverycomplicated.Theydifferfromeachotherinthreeaspects:pronunciation,vocabularyandgrammar.Andthedifferenceinpronunciationisthemostoutstanding.Over2000yearsago,Chinesepeoplerealizedthatacommonlanguageshouldbeusedinsocialactivities.Comparedwithdialects,mandarincanbeunderstoodbyallpeopleinChina.Theuseofmandarincancontributetoinformationtransmissionandculturalexchangebetweenethnicgroupsandpeopleindifferentplaces.