To reveal the influence of biaxial coupling effect on the multi-dimensional seismic performance of flanged reinforced con? crete （RC） shear walls with different section forms， three T-shaped and two L-shaped RC shear walls were tested under low cyclic loading along their principal axes. The failure modes， hysteretic characteristics， bearing capacity， ductility， ultimate drift ratio， en? ergy dissipation capacity and reinforcement strain of RC shear walls with flange under uniaxial and biaxial lateral loading were com ? pared and analyzed. Test results show that failures of T-shaped walls and L-shaped walls exhibit obvious asymmetry， and the dam? age is concentrated at the free end of wall penal. Biaxial loading aggravates the cracking and damage degree of RC shear wall with flange， and is likely to cause local damage concentration. Compared with the RC shear wall with flange under uniaxial loading， the biaxially loaded specimens have smaller bearing capacity and deformation capacity in all directions， larger proportion of flexural de? formation in the plastic hinge area of web segment， faster energy consumption， poorer energy dissipation capacity in a single direc? tion， larger strains of vertical reinforcement in web and flange， and more obvious shear lag effect of flange. Biaxial coupling effect has more pronounced influence on the damage evolution of L-shaped walls than that of T-shaped walls， resulting in greater reduc? tion of seismic performance index of L-shaped walls under biaxial loading than that of T-shaped walls. Considering the biaxial seis? mic actions， the limit value of inter-story drift ratio of RC shear walls in China's seismic design code is still relatively safe， but the safety redundancy is reduced.