A study of the relationship between the production of peanut and sweet potato and meteorological condition is made. According to statistical analysis, conclusions are as follows: (1) The drought in summer or Autumn is a major natural disaster for paddy crops. (2) When the number of days with drought (the late part of June to July) is greater than 20d, the soil moisture is less than 30%, the production of peanut was poor.(3) When the number of days with drought is greater than 30d, from August to October, the moisture is less than 25%, the crops suffered from drought.(4) Heavy rain existed from June to October, the run off is quite large due to low soil moisture storage capacity of the sandy loam, the ecology would be poor.(5) Because the water storage capacity in soil layer is low, it would be changed the irrigational pattern from field irrigation into spray irrigation.