In dry farming region ofNingxia，the seed fertilizer in the production of oil flax can not meet the nutrient demandin the whole growthperiod，and it is impossible to carry out topdressing due to lack of irrigation conditions. In 2015～2016，field trials were carried out to study the effects of sulfur coated urea dosage on vegetativegrowth，dry matteraccumulation， economic traits and grain yield of oil flax in the dry farming and rain-fed agricultural region of PengyangCounty，Ningxia. And the yield increase effect and nitrogen utilization rate of different sulfur coated urea dosage were evaluated comprehensively.The results showed that sulfur coated urea effectively promoted the growth of vegetative organs of oil flax in dry farmingregion，contributed to the accumulation of dry matter，and significantly improved economic traits，grain yield and water -fertilizerutilizationrate，the increase was particularly evident in drought years. With the increase of the amount of sulfur coatedurea，thegrowth，economic traits and grain yield of oil flax plants alsoincreased，and the trends of various indicators in the two years were basically the same. Under the fertilization level of 187.5 kg/hm²，the average of plantheight，above -ground freshweight，above-ground dry weight and grain yield of the two years reached themaximum，reaching 55.98cm，8.72g，2.57 g and 1 648.64 kg/hm²，respectively. Compared with thecontrol，the increase was13.55%，137.09%，115.07%，and 32.16%.