Path planning technology is one of the important problems in intelligent robot. Firstly, based on the characteristics of intelligent mowing robot and traditional circuitous path planning algorithm, a new "p-d" circuitous path planning algorithm was proposed in the rectangular work region, which solves the problem of the best mowing coverage. Then the geographic coordinate system was transformed into the local coordinate system of the rectangular work region, and the traversal path equations of intelligent mowing robot in the local coordinate system were deduced. Finally, a detailed design experiment of "p-d" circuitous path planning algorithm was shown, which used to illustrate the application process of "p-d" circuitous path planning algorithm.