Abstract: There are considerable differences between Beiliu dialect and Bobai and Yulin dialect.In order to bridge the gap of studying Beiliu dialect and enrich the study contents of the dialectology and acoustic phonetics,the method of experimental phonetics is adopted to analyze the monosyllabic tone of the Liuma dialect in Beiliu City by experimental means.Furthermore,the tone values of the nine tone classes of the dialect according to acoustic experimental data and the tone-marks of five degrees are defined.Besides,the tone shapes and tone classes of the dialect differ from those of Beiliu dialect in urban district.All the above-mentioned points are elaborated from the perspective of acoustic features.Comparing with Beiliu dialect and Cantonese dialect,the tone of the Liuma dialect takes on a transition feature,that is to say,it moves near to Cantonese dialect,and the geographical position can interpret this phenomenon reasonably.