How to get from Guangzhou to Zhongshan Dayong Town? It is better to have a city rail. . .

Take the subway from Guangzhou south to Zhongshan North Station, where there is a direct train to Dayong.

I don't know where you are going. There is a bus to Dayong at Zhongshan North Station. Route 29 passes through the site:

Port Hospital, Port Town Government, Port Market, Democratic East, Starlight Harbor, Shuiheyuan, Zhongshan North Station of Metro, Unity, Building Materials Market, Chen Xing Square, Lion Jiaokou Bridge, Aolide Eye Hospital, Hua Fu Hotel, Fuzhou Hotel, Small Commodity Market, West Post Office, Zhongshan Bus Terminal, Xijiao, Han Yun, Kanxi, Longjuhuan and Shen Ming. Yongtou, Yongbian, Gangbei, Shuixi, Qifeng Road North, Xiaoyang Industrial Zone, Dachong Market, Antang, Lantian, Nancun, Nancun Market, Shijing, Shijing Industrial Zone, Lvli Garment Factory, Dachong Lu Quan.