The invention discloses a multi-area AC tie-line AGC performance evaluation method with DC power transmission participation, the method comprising the following steps: 1. establishing an equivalent model of a multi-area power network, equivalently dividing the multi-area into two connected large-area power networks, and determining that a plurality of tie lines are arranged between the two large-area power networks; 2, modifying a area control deviation, adding the support quantity of the DC power transmission system to the AC tie line power deviation, and determining a support coefficient matrix describing the output power distribution of the DC transmission system participating in multi-area tie line active power control; 3, establishing a DT standard according to the CPS standard formulation principle, changing a control objective in the original standard, and introducing the responsibility coefficient of the task allocation to active power control the multiple tie lines for each region; 4, determining support coefficients and constraining variables through system running conditions; and 5: determining the calculation formula of the responsibility coefficient.