The gravitational force due to the sea level rise causes secondary changes in the Earth's surface that are approximately a few centimeters. Although, these variations are negligible comparing to the direct tidal effects, regarding the precise satellite earth positioning methods (with a few millimeters accuracy) such as Global Positioning System (GPS), and Very Long Base Line Interferometry (VLBI), applying the above corrections in data processing is essential. In this paper, using a global ocean tidal model, in our case TPX0.6.2, the magnitude of the secondary effects for ten major tidal components including had been computed on the Earth's surface in Iran. The results indicated that the greatest amount of the secondary effects which is related to the M2 tidal component on the Oman Sea can reach to about 2.3 cm.