Abstract: When pigging the spherical pig in general contacts zonaly with the internal surface of pipe wall, it is hard to reach a perfect sealing between the pig and inside pipe wall, therefore, that the cleaning is not thorough and that the pig is broken often occur, so, the pipeline pig has been improved in material and structure, the hardness, abrasive resistance and leakproofness of which are all better than the pig, the performance of the pipeline pig is perfect. At the same time, because the pipeline pig is equiped with a signal transmission device, it either can monitor accurately the operation of pipeline pig in the pipe, or can locate it in higher accuracy if plugging occurs. Through calculating, listing and comparing the performances with the pig and the pipeline pig, the results showed that pipeline pig is better than the pig in operation and cleaning result except that the price of the pipeline pig is higher than the pig.