The new electrical power reform puts forward new requirements for labour cost input-output efficiency evaluation of power grid enterprises. Based on absorbing the reasonable components of the traditional labour cost input-output evaluation system and combining with the requirements of the new electrical power reform，this report creatively constructs the labour cost input-output efficiency evaluation system for power grid enterprises，evaluates five power grid enterprises which are at the same level with such evaluation system，demonstrates its applicability and operability，and comes to two conclusions：the labour cost control efficiency of power grid enterprises should be evaluated by labour cost input-output comprehensive index rather than any single index；strengthening human resource development and increasing talent equivalent are important means to improve labour cost control efficiency.