To alleviate energy consumption problem of micro-unmanned aerial vehicle（UAV） s

an adaptive adjustment method of transmitting power is put forward from view of image transmission system

and its effect of energy-saving is illustrated by modeling calculation. Based on Hata model and the receiving sensitivity model

transmitting power model for the UAV graph transmission system is established

and an adaptive method of transmitting power based on horizontal distance as standard is determined by using the control variable method.Through the example analysis

the energy-saving level of power adaptive under different working modes is obtained.The results show that the adaptive adjustment of transmitting power within 3

5 km can save more than 30 % of the original sy

stem energy.With increasing of the adaptive precision and the farthest transmission distance

the energysaving effect is improved.