Studies have shown that the impact of human activities on the drying of Lake Urmia, the largest lake in the country and the world's second largest saltwater lake, have been more effective compared to climate changes such as drought. The transformation of the lake into a salt marsh and eventually a desert area, have had many consequences including the loss of agriculture, groundwater salinity, severe effects on different species of animals, skin diseases, poverty and the forced migration of the residence in the area. The consequences of drying up of the lake will not only affect on Azerbaijan but also on fifteen neighboring provinces and countries. The main factor influencing the drying up of the lake is numerous dams on the basin, so that 95% of the collected water behind the dams is used for irrigation with low efficiency. Increasing the efficiency of irrigation water is the best solution for the lake crisis. On the other hand, increasing population and demand for agricultural production have led to overuse of water resources, soil and other natural resources, thus the need for agricultural information is increasing. Field experiments are time-consuming and costly and obtaining information by conventional methods is not adequate, since they are limited to the time and place of the experiment. Over the last several decades, agricultural models have been helpful in this area. The Decision Support System has developed by International Benchmark Sites Network for Agrotechnological Transfer (IAT) presented for agricultural technology transfer. In this experiment, different planting strategies of wheat and corn by DSSAT modeling software on Miandoab station under current climate conditions was studied. Treatments include planting date, soil texture, the amount of irrigation and fertilization were evaluated. For planting corn, five planting dates, five soil textures, four water threshold levels in soil for irrigation, for levels of fertilizer and combination of these treatments in a total of 400 cases were studied. According to water productivity index, june 5 (khordad 15th) with 50% maximum allowable deficit and 300 kg/ha nitrogen fertilizer was considered as the best strategy for corn. All mentioned treatments for planting wheat considering sowing dates were studied and finally, planting on october 23 (Aban 1th) with 30% maximum allowable deficit and 200 kg/ha nitrogen fertilizer for most soils was chosen as the best strategy. Keywords: Urmia Lake, DSSAT, Productivity index of water, Threshold