（1.College of Civil Engineering,Yinchuan Energy Institute，Yinchuan，Ningxia 750105；2.College of Civil and Hydraulic Engineering，Ningxia University，Yinchuan，Ningxia 750021；3.The Center of Hard Technology Research on Water-saving Irrigation and Water Resource Regulation in Ningxia，Yinchuan，Ningxia 750021；4.The Center of Engineering Research on Modern Agricultural Water Resources Efficient Utilization in Arid Region，Yinchuan，Ningxia 750021）
Many factors can influence gravel-mulched field productivity evaluation，the evaluation must be in the natural resources conditions，the middle arid zone of Ningxia as the study area，study on gravel-mulched field productivity evaluation index system.Index system considers five indexes of sand carrying capacity，water level years，chemical level，the level of agricultural mechanization and the cultivated land population pressure，with the TI index model for gravel-mulched field productivity evaluation index system about the society-economy conditions，the corresponding evaluation grade division.By the analysis of yield，between Y and evaluation index of TI gravel-mulched field watermelon there is a linear correlation between Y=1 261.5TI+566.18，the index system model can better evaluate gravel-mulched field productivity of social economic conditions.