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For explaining the reason of China’s long march series of rocket wreckage landing point is in front of the expected one,through comparing many times flight data , we find during the first ascending stage,the flight position and velocity are systemic different from the normal trajectory data,especially the error or Vy even exceeding 5%,which is not acceptable during the design period.And finally we assure the mechanism behind the phenomenon is the attitude control law of “attitude angle deviation+ attitude rate”,which is widely used by Long March rockets.After comparing several potential ways,the “double deviation attitude control scheme” of “attitude angle deviation+ attitude rate deviation” is selected,which can significantly improve the precision of trajectory accuracy and wreckage landing accuracy, reduce the aerodynamic load, improving the quality of the rocket flight.