Under the condition of diminishing water resources, it is necessary to have practical solution for water management in every scope of civilization management for preserving and expansion of landscapes in arid climate. The type of plant as well as the density, which makes their irrigation management much more complicated than their farm. Knowledge of microclimate coefficients is indeed very important in landscape water management in urban areas. The purpose of this study were to construct a quantitative method for measuring microclimate coefficients and extend LIMP model for Isfahan climate.For the purpose of computing the reference crop evapotrairation in landscape (ET 0L ) and microclimate coefficients, we have collected data from five different climate stations across the city of Isfahan, with diversity in their surface type, population density and traffic pattern . Three years (from Fall-2010 to winter 2013) air temperature and humidity in these five stations have been used for further analysis . Also, the weather data collected from Research Centre for Atmospheric Chemistry, Ozone and Air Pollution in Isfahan province was used as reference station. For calculating the accuracy of the simplified method, we used R 2 index and the slope of linear regression (b). Dew point, microclimate coefficient and landscape evapotrairation were calculated for five stations across the city.The highest dew point for station 1 was 7.77 °C in June and the lowest was -6.5 °C for station 2 in January. The highest microclimate coefficient was 1.21 observed in station 5 in January and the lowest observed was 0.84 at station 2 in October. In all the stations except for station 5, the lowest microclimate coefficient was observed in winter and fall and the lowest was observed in summer. Our findings in this study show that the drier climates in station 4 and 5 due to more populated residential and commercial areas and higher traffics will result in higher microclimate coefficients. The stations which have more vast landscape coverage with artificial water fountains and lakes (stations 1, 2, and 3), have lower microclimate coefficients. The annual calculated ET 0L were 1857, 1694, 1600, 1085, and 1905 mm for stations 1, 2, 3, 4, and 5, respectively.In addition to quantifying the microclimate coefficients in monthly scale for Isfahan climates, this results showed that there is a considerable ET L in different urban stations. So, we recommend to have attention to microclimate coefficient for calculating ET 0L in urban area. Keywords: Landscape coefficients, microclimate coefficient, urban green space, urban microclimate, landscape evapotrairation, water use