Aiming at the problem that traditional droop control method can not adjust the droop control coefficient according to the variation of voltage and power deviation, a method of using fuzzy reasoning to change the droop control coefficient is proposed. On the basis of analyzing the mathematical model and control strategy of VSC converter station, the control characteristics of AC and DC nodes when VSC adopts droop control strategy are considered and the calculation process of power flow model of VSC-HVDC system is determined based on the theory of fuzzy droop. Also, an improved power flow algorithm of fuzzy droop control for VSC-HVDC system is proposed, which adjusts the deviation between DC voltage and active power of VSC. Finally, the numerical example shows that the proposed fuzzy droop control algorithm can reduce the power and voltage deviation in the iterative process of 4~5 times DC system, and has stronger convergence and feasibility. This work is supported by Science and Technology Project of State Grid Corporation of China “Short-circuit Current Analysis and Treat Measure Research of Jiangxi Power Grid in the Situation of UHVDC” (No. 521820160018).