The invention provides an HVDC transmission system steady state response calculation method based on an analytical method. The HVDC transmission system steady state response calculation method comprises the steps of: A, establishing a linear differential equation describing dynamic behavior for a smoothing reactor, a DC filter and a DC power transmission line of an HVDC transmission system; B, establishing a linear differential equation for a rectifier and an inverter in different switching on and off states; C, combining voltage-current relations and the linear differential equations obtained in step A and step B so as to obtain a differential-algebraic equation group (described in the description) of the HVDC transmission system under different operating conditions; D, calculating a phase angle theta[0] and a state variable initial value x[i0] of an AC voltage under the ith operating condition by utilizing a quasi-steady-state model according to a trigger delay angle alpha at a rectifying side, a trigger advance angle beta at an inverting side and a transformer ratio K of the HVDC transmission system on the basis of control rules of an AC system voltage and the HVDC transmission system; E, carrying out calculation within a cycle T of AC systems at both sides of the HVDC transmission system; F, judging whether the calculation is convergent; and G, calculating whether the obtained numerical value meets the control rules.