In order to develop the shallow (TVD 300～600m) low-permeability and low-abundance oil reservoirs and enhance oil recovery, Yanchang Petroleum Group tried to deploy shallow infill horizontal wells for adjustment development in the old well site of oil well area, the study was carried out on anti-crossing technology with characteristics of Yanchang oilfield under the adverse limitation of complex engineering and geological conditions. By wellbore trajectory optimization, precision anti-crossing scanning and the supporting technical measures, the well azimuth can be effectively controlled with active anti-crossing. The field application shows that by this technology, crossing is avoided for shallow horizontal wells and old well net to keep the drilling operation safety, which provides a new way to the development of difficult-to-produce shallow oil reservoir in middle-late stages.