The process of high rise building in Mashhad has been considerably increased during the last years. Despite of solving the problem of shortage of land and housing, this caused many problems in different environmental, physical-spatial, functional, social, and demographic aspects. In fact, loading of land-use intensity (plot ratio) affects different aspects of urban environment. In the present study, the aim is to discuss plot ratio and high rise building policies in Mashhad, and its physical-spatial effects. This study is conducted on Sajad Blvd. and North-South Janbaz Blvd. trading corridors, as a sample of tall buildings erected on the trading corridor in Mashhad, in which the growth of high rise building during the recent years in these two corridors has been strictly increased. Then, it analyzes plot ratio indices through documentary and library studies and field approach. Finally, SWOT method is used in order to evaluate advantages and disadvantages of high rise building in both corridors. The results from the studies conducted show that current plot ratio and high rise building policies, in terms of physical-spatial effects, have caused damages to access network and aesthetics, and only has a considerable financial contribution economicall

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