The invention relates to a method for executing an at least semi-autonomous parking process of a vehicle (13) by means of a parking assistance system (15), in which ambient conditions of the vehicle (13) are sensed as it travels past a potential parking space (3), and a parking path is determined as a function of the ambient conditions and of the parking space (3), wherein the ambient conditions comprise at least one obstacle (18, 18′, 18″) which is external to the parking space and does not directly bound the parking space (3) and is detected as near to the vehicle and is taken into account in the determination of the parking path (3), wherein the parking process is executed in a plurality of manoeuvres (26, 27, 29; 34, 38, 39), and at least one manoeuvre (26, 27, 29; 34, 38, 39) which is executed with an autonomous steering intervention is determined in terms of its profile as a function of the obstacle (18, 18′, 18″). The invention also relates to a parking assistance system (15) for a vehicle (13).