Abstract: In order to achieve high yield and quality goal in the place where isn’t quite suitable for growing strong gluten wheat, adopting field trials and statistical analysis methods, we cultivated strong gluten wheat on the sandy loam type area where was often lack of potassium and carried out the research about high quality effect to postassium yield of strong gluten wheat. The results showed that, in sandy loam soil available potassium contents in plough layer of Yudong about 90 kg/hm² conditions, based on the application of nitrogen and phosphorus fertilizer, if we applied potassium (K₂O) 60-300 kg/hm², strong gluten wheat yield increased by 18.7%-41.4% and the average yield increased by 30.6%. The relation of sand loam strong gluten wheat yield and the amount of potassium was conic function, which was y= 5296.35 + 22.20x-0.059x2, F=55.76**. After increasing potassium, average grain protein content of wheat was 15.32%, the average increased by 1.72%, and the relative increased by 12.6%. Potash improved the quality of wheat flour, so wet gluten content was up to 35.2%-38.0% and the average was 37.1%, which was superior to one high-gluten wheat≥35% of national standard. Wheat flour mills deposition values 45.1-47.3 mL of potassium, it increased by 3.2-5.4 mL and improved the rheological properties of dough, such as time increased by 0.6-1.8 min, average by 1.3 min, and prolonged stability increased by 1.9-4.4 min, extended an average by 3.4 min. However, FU decreased by 2.8-9.3 and the average down to 6.3. Potassium increased production and improved quality, whose physiological and biochemical basis was the promotion of a flower to the flag leaf during grain filling rate and raising the pick flag to flag leaf during grain filling of sucrose phosphate synthase (SPS) activities. Under the test conditions, sandy loam soil of Yudong gluten wheat yield quality protection best of potassium (K₂O) for 180 kg/hm². Appropriate ratio of nitrogen, phosphorus and potassium fertilization (N:P₂O₅:K₂O) was 1:0.78:1.30.