The paper analysis of cause of higher working voltage of 200 kA pre-baking aluminium reduction cells combine production practices. Basis on energy saving position at present, put forward some technology measures of reducing working voltage. 本文结合生产实践,分析了200kA电解槽投产初期工作电压较高的原因和降低工作电压的途径,结合目前的节能形势提出了降低工作电压的一些技术措施。