Accurate navigation of farmland operation carrier is an important condition to improve the efficiency of farmland operation in Xinjiang. At present, the commonly used map navigation software, such as Amap and Baidu Map, cannot achieve precise navigation in the farmland because of the accuracy of the map. Moreover, because of the vast area or the occlusion of sight in the farmland, it is difficult for the operation carrier to find the target point quickly. In view of this, a method was proposed to find the best field path by combining the Google Map API, the Amap API and the shortest path algorithm. Firstly, the boundary outline of the test field was depicted by Google Map API, and based on the location information provided by Amap API and Android application framework, the Xinjiang farmland navigation APP running on Android platform was designed and developed. The application effectively realized the precise navigation of different operating carriers such as human and ground machinery in Xinjiang cotton field, which was beneficial to agricultural technicians and operating vehicles in the path. In complex field environment, pest review and other operations such as spraying pesticides were of great significance to improve the efficiency of cotton pest control in Xinjiang.