The differences between study<cite> [3]</cite> and our work are two-fold: (1)They focus on document-level varieties of Mandarin in China, Taiwan and Singapore, while we deal with sentence-level varieties of Mandarin in China, Hong Kong, Taiwan, Macao, Malaysia and Singapore. In order to investigate the detailed characteristic of different dialects of Mandarin Chinese, we extend dialects in Huang and Lee<cite> [3]</cite> to 6 dialects. Also, the more dialects there are, the more difficult the dialects discrimination becomes. (2)The top-bag-of-word they proposed in Huang and Lee<cite> [3]</cite> is word uni-gram feature essentially. While in this paper, besides the traditional uni-gram feature, we propose some novel features, such as character form, PMI-based and word alignment-based features.