The on-site RAP hot recycling method is to use mobile on-site hot recycling equipment to heat the old RAP, raking, and adding regenerating agent, new bitumen, and original aggregate into the mixer after excavation so as to obtain excellent recycled asphalt concrete. Compared with the pre-mix recycled asphalt mixing plant, it has some disadvantages, like larger equipment investment, more difficult on-site construction quality control, increased road elevation after the repair, untreatable harmful smoke released during the production process.