Abstract: The parallel temperature data obtained by automatic weather station (AWS) and manual in Longkou national reference climatological station in 2008 was used to analysis the temperature difference features and to research the relationship between the differences and other meteorological elements.The results showed that:① Temperature observed by AWS was basically higher than manual;the difference was larger in summer half year and smallest in winter;the difference was bigger in the day and smaller in the night.② The discrepancy of two temperature measure instruments (system bias) and the variance of observational time was the main reason to cause the difference.③ The comparative difference was smaller when temperature was lower and larger when temperature was higher;when the daily mean temperature was 0—10 ℃,the comparative difference increased significantly with increasing temperature.The comparative temperature difference had significant decreasing trend with increasing wind speed.The relationship between the cloud,precipitation and the comparative temperature difference was not significant.