Researches related to understanding the distribution of soil moisture in non-tillage system, seek to asset the degree of homogeneity of water availability to plant soft his management system. Therefore, the aim of this study was to evaluate the spatial distribution of soil moisture in non-tillage system in an Oxisol in the south western region of Goias using a TDR sensor. This was done using the TDR (Time Domain Reflectometry) sensor, from Campbell Scientific Company, the Hidrosense model with stems of 0.12 meters length. The work was carried out during the initial planting of 2013/14 season, in november 2013, on the three most superficial layers (0 0.12, 0.12 0.24 and 0.24 0.36 meters). The precipitation before moisture data collection was not enough to moisten the entire soil profile analyzed. Therefore, values of soil moisture between 18 and 56% were observed. Some related researches done near the area addressed in this research area indicate that the maximum moisture near the saturation condition is 52 % of moisture on a volumetric basis. However, it was observed a variation of approximately 10 % between the measured values in the field and on the water retention curve of the soil. Therefore, this preliminary analysis of the distribution of soil moisture, provide elements for refined calibration of this instrument enabling a larger sample moisture data measured directly in the field without the need to collect soil samples and subsequent laboratory analysis.