For the high cost of aerospace remote sensing platform, low sampling accuracy, no real-time characteristics, four-rotor aircraft with the acquisition device is proposed as a low-altitude platform sampling farmland information. The major way of getting the soil information is summarized, and it is pointed that the character of four-rotor aircraft will be suitable for high-density, real-time farmland information acquisition platform. The development of the four-rotor aircraft domestic and international is discussed, the structure and inertial measurement system of the platform is analyzed, the platform prototype with weight of 1200g and life time more than 20 min is developed, at last three ways of collection farmland information are designed, such as the use of wireless sensors far from ground, the use of rotor wind near the ground and the use of devices direct contacts with the ground. Aircraft platform on basis of sentinel hover technology can achieve a variety of new farmland access to information.