Q100 agricultural UAV, newly developed and independently researched by United Aircraft, is a multi-functional flight platform specifically designed for modern agricultural needs. Moreover, spraying, spreading, transportation, and aerial surveying are integrated. It is equipped with a newly-upgraded intelligent operation system and power system to ensure more precise and efficient operations. The obstacle avoidance and terrain-following flight functions should be designed to suit for different scenarios. Stable operation is guaranteed in various working environments and the safety of operators for multiple safety strategies and higher protection levels. A mobile integrated take-off and landing platform is adopted. Its platform is suitable for farmlands of various sizes to become an efficient, intelligent and safe choice for agricultural production.