The issue under discussion in this paper results from a practical task faced with research institutions and manufacturers for gas station equipment, and will be divided into two parts: 1. In order to observe the impact of storage tank displacement on tank gage table, the author, on the premise of the displacements parameters, to detect the corresponding values of oil level and volume and analyze the law of change of the tank gage table through modeling and provided a revised tank gage table. The above belongs to direct problem. 2. Based on the data from practical detection, the paper will identify how the displacement occurred and the level of the displacement. Meanwhile, the measure and result of calibration will be offered. All the above belongs to inverse problem.