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The phenomenon of Mandarin Mingled by Cantonese is widespread in Guangdong dialect area. It is mainly reflected in the heterogeneous pronunciation and vocabulary, and its performance degree reflects speakers’ Mandarin level. In the summer of 2019, this paper investigated the Pearl River Delta area and found that: The development of Mandarin level is unbalanced. According to variance analysis and expert scoring, the equilibrium degree can be divided into four gradients from good to bad. The first gradient: Shenzhen; the second gradient: Zhuhai, Guangzhou, Dongguan; the third gradient: Foshan, Huizhou; the fourth gradient: Zhongshan, Jiangmen, Zhaoqing. It’s wise to strengthen the promotion of Mandarin in Guangdong, to promote the balanced development of regional economic integration.