In order to graphically display GPS water vapor data to the user, after introducing inversion of GPS water vapor principle in the brief and reviewing Surfer applications in drawing contours, this paper imported surfer to the application of GPS water vapor data in the background of Fujian GPS water vapor monitoring system. Through designing GPS water vapor contour production system displayed the process of drawing GPS water vapor contour automatically by C# called Surfer. The results indicate that the contour produced by the system can effectively reflect the distribution of water vapor content and changes over Fujian and provide a reference to the related weather forecasting.