Welfare of gilts housed either in indoor or outdoor was tested by human approach test that was used to identify problems in human-animal interactions. Sixteen gilts were housed outdoor and eight gilts indoor for 30-44 days before the test started. The indoor system was more space limited and thermally controlled and had human contact about 15 min daily during cleaning out. The outdoor system was more extensive, had much greater space accessible, not thermally controlled, and had human contact during feeding and cleaning period daily that lasted about 1 hr. At testing, each gilt was moved into a test arena. After 2 min familiarization period, an unfamiliar human entered the test pen and stood motionless for 3 min against the wall and then approached the gilt and touched her snout. Throughout the experimental period, heart rate, behaviour and sound within the test arena were recorded. Outdoor gilts had lower heart rates and performed fewer vocalizations and less locomotor behaviour over the 3 min test period. Outdoor gilts tended t be slower to approach the human, but then took less time to make physical contact (3.3 vs. 52.7 s). The results indicated that the human approach test could not approve that outdoor gilts were more fearless than indoor gilts. The authors suggested that when using human approach test to assess animal welfare on farm, systems differences should be taking into account.