This paper studies a coordinated control strategy of voltage source converter based multi-terminal high voltage direct current（VSC-MTDC）under different operating conditions.The improved direct current（DC）voltage-active power regulation characteristic curve of the VSC-MTDC system is proposed，the slope control and DC voltage control mixed in the existing characteristic curve，and the coordinated control strategy implemented based on the improved characteristic curve.When the ring net-wiring VSC-MTDC system is operating in steady state，the relationship between DC voltage and active power of each converter is derived，and the calculation method of the DC voltage at the inflection point of the DC voltage-active power regulation characteristic curve is given.Finally，simulations are performed in PSCAD/EMTDC to verify the validity of the control strategy under different operating conditions.Simulation results show that the coordinated control strategy can meet the requirements when the VSC-MTDC system is operating under different conditions.