Abstract: According to the characteristics of "benefit in post" and "defeat in front" of the parallel mining pit ditch-dumping, bridging is put forward to connect the transport channels between the end slope and inner dumping to reduce the stripping in row distance. The main parameters of the bridge are designed with the help of the geometric shape of the end wall, the moving distance of the bridge is proposed. Setting up the economic benefit equation of moving distance. Combination of Haerwusu and Heidaigou opencast mine as an example, calculated the end slope internal dumping ditch bridge optimal advancing distance is 260.7m.