This period, Liu also serves as the Tang imperial plenipotentiary, made several trips back to knot Tiele comfort, went to Tuyuhun, spit Phan Xuan Chi, are successfully completed its mission.

• 此期间,刘氏还作为唐朝廷全权代表,数次前往回纥铁勒抚慰,奔赴吐谷浑、吐藩宣敕,均圆满完成使命。