A field information acquisition instrument to measure the soil pH value and electrical conductivity (EC) was designed. Based on the measurement theory and the software and hardware design of the instrument, the calibration test to the acquisition instrument measuring pH value and electrical conductivity by means of two-point and the standard KCl solution was carried out. Then 15 soil samples were taken from a piece of bean field with the sampling interval of 14m×14m. The validation test to the calibration equation was carried out. The results showed that the relative error between the calibration result and the accurate value for soil pH value is less than 1%, and the relative error between the calibration result and the accurate value for soil EC is less than 14%, the linear regression model significance probability of the soil pH value calibration results and exact value is 0.0478,R2=0.8978,the linear regression model significance probability of the soil EC calibration results and exact value is 0.0004,R2=0.9716,it is proved that the calibration equations of the pH value and EC are reliable.