On the evening of August 7, according to an announcement released by Zhengzhou Metro, the Phase I project of Line 7 has now achieved "tunnel breakthrough" (full tunnel boring completion), track installation is 99% complete, and the ventilation, water supply and power installation and decoration works are 86% complete, creating favorable conditions for achieving completion and opening to traffic before the end of the year.

Phase I of Line 7 is a north-south supplementary line in the central urban area of Zhengzhou, starting at Huanghe Expo Museum Station and ending at Nangangliu Station. The line has a total length of approximately 26.8 km, entirely underground, with 21 stations, including 8 transfer stations, respectively connecting with Line 1, Line 2, Line 3, Line 4, Line 5, Line 10, and the northeast section of Phase I of Line 6 and Line 8, both under construction. One new depot and one new parking lot are built: Dongzhao Parking Lot at the northern end of the line and Nanhuan Depot at the southern end. The trains adopt Type A cars in 6-car formations, with a maximum operating speed of 100 km/h.