In order to realize the path tracking and control of crawler tractor in the field under the complexenvironment, an automatic driving system was designed and the tracking algorithms of this system werestudied. The automatic driving system contained MCU, double laser positioning system, speed control system,ignition/extinction control system, and hydraulic steering system, etc. To track and control the route of crawlertractor, fuzzy algorithm was used to compensate the deviation of the traveling process. Matlab/Simulinksimulation and field experi...