Mining deformation monitoring is an important component to mining safety and sustainable development. Comparing with the static relative positioning results, the GNSS real time kinematic (RTK) observation data collected in the field was used to analyze the effects of rover pole inclination angle on its horizontal and vertical positioning precision. The results show that the inclination of rover pole has greater impact on the horizontal positioning precision than the vertical positioning precision. The horizontal positioning precision of millimeter level can be obtained by using tripod mode. We obtain centimeter level vertical positioning precision due to its related to the height difference between points.