Abstract: In order to find common buckwheat varieties and their supporting cultivation techniques suitable for cultivation in the eastern and western Inner Mongolia,six factors including five variety, sowing date, seeding rate, nitrogen fertilizer, phosphate fertilizer and potassium fertilizer were designed at 5 level orthogonal experiment, the experiment was continued planting in Naiman and Guyang bases for 2 years,the results showed that new varieties suitable for planting in the eastern part of Inner Mongolia area was Mongolian 1202-3, The supporting cultivation technology was sowing date on June 29, and seeding amount was 45 kg/hm^2, nitrogen fertilizer was 60 kg/hm^2 and potassium fertilizer was 67.5 kg/hm^2. The common buckwheat varieties suitable for planting in western area is born in the North, and the supporting cultivation techniques was sowing date on May 23, sowing amount was 45 kg/hm^2,it need nitrogen fertilizer 75 kg/hm^2, phosphate fertilizer was 30 kg/hm^2, potassium fertilizer was 90 kg/hm^2,it is clear that the key factor influencing the yield of common buckwheat among the six factors is sowing date,the meteorological factor and yield show that meteorological factor with the largest correlation coefficient is accumulated temperature.