To put it bluntly, the route construction is the same as the paving of the water-stable layer we usually do, except that the elevation control line is placed on both sides of the subgrade when paving the water-stable layer. The elevation control line of the route construction is based on the paving width of the asphalt paver +0.3-0.5m, that is, the elevation control line is moved to the edge of the paver to facilitate its contact device. The number of elevation control lines depends on the width of your subgrade and the paving width of the paver. For example, the width of my roadbed is 12m, and the maximum paving width of paver is 6m, so my control line can only be placed at 6.3m—6.5m The control line of asphalt pavement generally adopts steel wire, and a point of 5- 10 m is fixed with steel wire and tightened with tightener. Measure the corresponding elevation of the original water-stable layer, and then subtract the measured elevation from the design elevation, so as to determine the height of the steel wire and tie it firmly with tie wire. A control line, and so on.