In September 2006, "Dongguan City Rapid Rail Transit Construction Plan" passed through the Provincial Development and Reform Commission.

Experts recommended that the initial scale of the plan be brought down to about 60km and give priority to the development of Line 2.

[9] City rail transit construction project formally entered operational phase.

In December 2013, with the consent of the State Council, the NDRC approved the short-term construction plan for urban rail transit in Dongguan (2013-2019).

The second phase of the project, a total of 164.6 kilometers of urban rail transit lines in Dongguan City, has been approved by the state.

On December 8, 2014, the two shield tunnel borers break through to Shan Mei ~ Exhibition Centre, marking the second line main project completion.

[11] On August 26, 2022, the groundbreaking ceremony for the south extension of Dongguan Rail Transit Line 2 was held in Humen Town.

The extension is 17.1 km long with 9 station and will directly serve Humen Town Center after its opening planned for 2027.