With a short view of the conditions of the world's environment in the last two decades , we can say that despite the recent controls in the field of the environment, not only the adverse human effects have not been decreased, but also problematic issues such as high atmospheric pollution, ozone layer depletion, greenhouse phenomenon and global warming and numerous effects caused by these phenomena have been emerged. On the other hand, the extreme growth of urbanization and the increase of the urban population in different countries after the Second World War has emphasized on the need to consider urban issues for planners and the experts involved in urban affairs. The important point that has received attention by all individuals is urban growth and development patterns. In recent decades, cities and urban areas have expanded their original size mostly in a short period of time. Their development in separate, unplanned and unorganized parts has become recognized as the pattern of urban expansion or horizontal distribution and is the source of many problems in developing and developed cities and has adverse impacts on the urban environment and forest areas of the city. The present research is aimed to examine and measure the growth pattern of Shirgah city on the environmental quality of forest areas of the city. The research methodology is based on descriptive-analytical approaches, in which statistical models and SWOT technique have been widely used to measure the effects of physical development of the city on the environmental quality of forest areas. Besides using documents and library studies, a questionnaire is developed for data collection, which was distributed among a sample of 352 people. Based on the opinion of experts in the internal and external factors matrix and the planning matrix by SWOT model for data analysis, the quantitative strategies were extracted. The results of the SWOT technique showed that in the internal matrix with a total score of 2.587, it indicates the amount of strength, and in the external matrix with a total score of 2.431, it indicates the amount of threat. We found that the strengths and threats related to the impacts of the city growth pattern on the environmental quality of the forest areas were dominant; thus, four strategies have been presented in this regard. It is worth to mention that ST strategies are prioritized, so the implementation of ST strategies in the activities is highlighted to achieve the desired result.