The right hole of Lehua Tunnel, the deepest highway tunnel in Qinghai Province, is connected. The tunnel is located in Qutan Town, Ledu District, Haidong City, and Bayan Town, Hualong County.

The total length of the right line of the tunnel is 5,933 meters, all of which are grade IV and V surrounding rocks, of which grade V accounts for 74.2% and grade IV accounts for 25.8%. The regional topography, geology, and hydrological environment are complex and unfavorable.