Abstract: In order to determine the impact on soil temperature, humidity and yield of straw mulching on different time and different covering amount in the case of row spacing reduced, by Shrinked row of the planting, covered with corn straw pole. Used split-plot design, two main areas were: A1 (covered after winter) and A2 (covered before winter), the deputy district was four different amount of coverage and not covered. The results showed that, in 0-15 cm soil temperature-sensitive layer, the covered before winter warmed was obviously than after winter, the ground temperature curve of the amount of different levels coverage was the same basically during the entire growth period; the changed trend of the 0-40 cm soil moisture in the reproductive was same basically, the soil moisture before winter coverage averaged 0.54% than after winter; the dry matter accumulation of the amount of processing after winter mulched was significantly higher than that each treatment coverage before winter at heading -grain filling stage, the dry matter accumulation of each treatment of coverage before winter was higher than after winter at maturity; the biggest difference of yield performance were A2B3 (3669.12 kg/hm2) and A1B2 (3654.79 kg/hm2). Description that the coverage of 6000 kg/hm2 before winter was significantly for increasing yield. Therefore, using entire pole coverage of the corn, indenting densification, forming the mode of different broadcast pieces and zone width of cover cropping patterns, warming soil moisture, water-saving increase, improving the utilization of the water is an effective way of wheat yield stable.