Abstract: When simulating cathodic protection of buried pipelines in laboratories, it is necessary to perform multiple sets of experiments simultaneously in view of a variety of influencing factors. The traditional power supply of cathodic protection system is expensive and insufficient. In particular, the use of the traditional power supply is very inconvenient when cathodic protection is performed on the buried coupons in field. In this paper, an alternative scheme of cathodic protection on buried pipelines based on DC power supply was put forward. In this scheme, the effectiveness of the cathodic protection system which took dry battery as the forced-current cathodic protection power supply was explored through independently designed experiments. And the coupons of the experimental group and the blank group involved in the alternative scheme were compared by means of the weight loss method. It is concluded that coupons can be protected effectively for at least 30 days by the cathodic protection system which takes two 1.5 V dry batteries as the forced-current cathodic protection power supply.