In recent years, with the rapid development of UAV remote sensing technology, its application in the agricultural field has reached an unprecedented breadth and depth, greatly enriching the means of agricultural information acquisition, and playing an important role in agricultural situation monitoring, disaster assessment, yield investigation, vegetation phenotype acquisition, etc. Agricultural UAV has become an indispensable part of the aerial and aerial agricultural remote sensing system. Based on this, this book first analyzes the development of UAV, technical advantages and the composition of aerial photography system, and analyzes the application of UAV remote sensing in the agricultural field from the perspectives of weed identification and location, cotton nitrogen rapid diagnosis, corn growth dynamic monitoring, crop coverage estimation in irrigated areas and soybean lodging assessment, for reference only. Due to the limited energy of the author, it is inevitable that there are some shortcomings in the book, and I would like to invite your peers and readers to criticize and correct.