The electrochemical properties of doped 5% carbon nanotubes(CNTs) LaNi5 electrode have been investigated. The CNTs were synthesized by chemical vapor deposition method (CVD) using lanthanum nickel alloy(LaNi5) as the catalyst. Three-electrode system was introduced to test the electrochemical hydrogen storage behaviors of CNTs with Ni(OH)2/NiOOH as the assistant electrode and Hg/HgO as the reference electrode. 6mol/L KOH was used as the electrolyte, and the high discharge capacity was measured of 385 mAh/g at a discharge current of 100 mA/g. The doped 5% CNTs LaNi5 electrodes showed higher electrochemical hydrogen storage capacities and a longer cycle life than those of the un-droped CNTs. In addition, the discharge capacity decay was only 15% after 100 cycles.