Abstract: Many innovative enterprises, such as SpaceX and OneWeb, recently released plans building satellite mega-constellations at the low earth orbit, thus triggering a boom in the development of Satellite Internet. The public two-line element (TLE) is used in this paper to analyze the control strategy of the foreign constellations, including Iridium, OneWeb and StarLink. The mean semimajor axis difference of different satellites in the constellation is obtained by the relative phase difference analysis, to avoid the difficulty of estimating the maneuver of the satellite by the mean semimajor axis variation when the control value is small. Essential parameters like the orbital station keeping frequency and the control accuracy of foreign constellations are obtained. The conclusions obtained will provide a reference for the construction of the Internet constellation in our country.