Aimingattheconstructionofthe"erectingcablebeforeconstructingbeaml'inthetraditional erection of the self-anchored suspension bridge of the double-tower single-span hybrid beam, the temporary anchorage cost is high, and from the temporary anchor system to the permanent anchoring system process complex process defects, the overall erection method of"erecting cable before constructing beam l'with long duration, high cost, lack of risk, the construction plan of"cable beam synchronization l'based on the construction of Zhuzhou Feng xi Bridge is put forward, the difference of horizontal force of free cable an-cho rage between the span and raise-span ratio is analyzed, and the calculated value of the single-pier can resist the maximum unbalanced horizontal force and determine the feasible range of the construction scheme.The results show that：①The horizontal force of free ca-ble increases with the increase of the span， and decreases with the increase of the span ratio at the anchor.②When Span of 100~300m， raisers pan ratio in the 1/6.0~1/4.0 the horizon tal force of free cable is within 2900kN； when span of 100~300m， rise-span ratio in the 1/8.0~1/6.0， the span between the 300~450m， rise-span ratio between 1/6.0~1/4.0， the horizontal force of free cable is within 6400kN； when span in the 300~450m， rise-span ratio in 1/8.0~1/6.0， the horizontal force of free cable is above 6400kN， the maximum value is more than 10000kN.③The unbalanced horizontal force is supported by the lower pier of the cable anchor， which can meet the span of 100~300m， and the rise-span ratio is between 1/6.0~1/4.0.①The appropriate top of the dome or the edge of the pendulum area of a certain pre-stressed tendons， or in the design stage to increase the side pier section or moment of inertia can make the program implemented in the bridge with higher pier height，larger span and smaller span ratio.The engineering application showed the proposed method effective and accurate.