The microstructure and electrochemical properties of La1.3CaMg0.7Ni9-x(Al0.5W0.5)x(x=0,0.3,0.6,0.9) hydrogen storage alloys have been studied systematically. XRD and SEM analyses show that the alloys are mainly composed of the(La,Mg)Ni3 phase and the LaNi5 phase, but the Al and W substitution for Ni results the disappearance of the (La,Mg)2Ni7 phase and the segregation of W pure metal phase. The cell volumes of the (La,Mg)Ni3 phase and the 38697df08835aa4b83a"" title=""Click to view the MathML source"">LaNi5 phase increase by adding the content of Al. With increasing x, the maximum discharge capacity of the alloy electrodes decreases from 380 (x=0.0) to 317.6 mA h/g (x=0.9). However, cyclic stability is noticeable improved from 72.2 % (x=0.0) to 85.2 % (x=0.9) up to 100 cycles. The HRD and exchange current density I0 of the alloy electrodes decrease first and then increase.