For the coaxial rigid rotor compound high speed helicopter configuration, two trim methods of operation manner are put forward by analyzing the characteristics of operation: the switching operation manner and the coupling operation manner. The advantage and disadvantage of two operation manner are analyzed emphatically. From the redundant command of multi-control surface, the control rules of coupling operation manner are acquired by trim analysis. At the same time, the loads of the main rotor and the rear propulsive rotor are evaluated according to the trim results. According to research results, the collective control and the cyclic control of main rotor of coaxial rigid rotor high speed helicopter are associated with flight speed and airframe angle of pitch, and the loads of the main rotor have a big increase from current helicopter, at the same time, are also associated with airframe angle of pitch.