Several research suggests that too much artificial stimulation and little, or no exposure to natural environments can cause loss of vitality and affect health. One of the indicators for the deterioration of people in urban settings is mental fatigue, where the behavioral impact such as stress (Kaplan, 1995).Other studies (Van den Berg, Staats & Hartig 2007) have found that nature can help people to cope to stress and to improve the function in cognitive and emotional areas.These responses come from the psychological restoration, which is understood as the renewal of the physical, psychological and social resources to the adaptive demands coming from the socio-physic stages (Hartig, 2004).Some definitions of what a restorative environment is, suggest that this place, whether it is natural or constructed, is capable of renewing individual attentional resources because it has no harmful environmental characteristics, and it may encourage reflection. This helps to reduce stress and fosters mental fatigue recovery.The aim of this study was to test the relationship between stress and the evaluation of the environmental characteristics that leads to its perception as a restorative place.Based on the Environmental Restoration Scale which comprises: Being away, Fascination, Coherence and Compatibility factors (Korpela and Harting, 1996), it was made through the semantic modified networks technique (Reyes-Lagunes, 1993), an exploration of the concepts that mexicans relate to each one of them. This resulted in a valid and reliable scale formed by 25 reagents with a reliability of .965, and a variance explained of 68%.To measure stress, it was used the Stress and Arousal Adjective Checklist developed by King, Burrows and Stanley in 1983, which was adapted for Mexican population by Ortega et al (2005).The sites evaluated were two green areas of a campus. Participants were 180 people from 16 to 47 years old. Data was collected during the seven days of the week.To test the relationship between the stress and environmental restoration, an analysis of structural equations was applied.The model fits the data satisfactorily in accordance with the indicators of goodness of fit: x2=6.37 P=0.27 CFI=1.00 RMSA=0.04. With the estimated model results, we analyze the overall effects obtained for Restoration in the next estimated equation: Restoration=.319*(arousal)+.282*(days)-.340*(Stress)+3.14error+.760error. This equation indicates that the higher arousal site is perceived as more restorative, weekend is perceived as a more restorative place, and finally, to lower levels of stress better its perception as a restorative place.Therefore, this study proved the relationship between stress and the evaluation of restorative places, as well as the relationship of environmental restoration to the goals of the visitors, this way a space can be evaluated differently according to the day of the week.