The marine environment is changeful. The steel catenary riser is prone to produce fatigue damage so as to affect the safety of production on effect of complex marine environmental load. In order to study the dynamic response of the riser under environmental load, the paper built SCR model by use finite element software ABAQUS.By applying displacement boundary condition on the upper suspension point of the riser to simulate the movement of floating body, using the nonlinear spring whose stiffness is based on P-y curve to simulate the riser-soil interaction, adjusting the parameters of environmental load on the riser,it studied the influence of floating body motion, wave amplitude, wave period and current velocity on SCR dynamic response. The results show that the steel catenary riser presents different dynamic response with the change of environmental load, the riser is more sensitive to heaving motion of floating body; the larger the wave amplitude ,the less is its period, the larger the dynamic response of the riser on suspension point and touchdown point;with the increase of current speed, the overhanging length gets bigger.