Where is Chengdu 106 Ring Road connected to 318?

Are you asking about National Highway 318 or National Highway 319? The question asked about National Highway 318, and what is mentioned below is National Highway 319.

If you are going to the 318 National Highway, then you can take the S106 line from Dujiangyan, pass through Dayi and Qionglai, and then get on the 318 National Highway in Qionglai (the section from Chengdu to Qionglai has been converted into an expressway into the Wenqiong Expressway ).

If you are going to National Highway 319, then you have to pass Dayi, Qionglai, Pujiang, Danling, Meishan, Renshou, Ziyang, Jianyang, and then you can get on National Highway 319 in Jianyang.

S106 (Western Sichuan Ring Line)

Passing locations: Pujiang, Qionglai, Dayi, Dujiangyan, Shifang, Deyang, Zhongjiang, Ziyang, Renshou, Meishan, Danling, Pujiang