With the rapid development of urban logistics unmanned aerial vehicle （UAV） transportation， multirotor UAVs， due to their vertical take-off and landing capability and agile maneuverability， have formed air route networks with wide coverage and diverse operational modes in many cities. However， urban low-altitude airspace is constrained by high-rise buildings， complex terrain， and dynamic wind fields. It also faces practical challenges such as communication interruptions and low public acceptance. These factors make scientific air route planning a key component for ensuring operational safety and efficiency. First， this study reviews the air route design schemes of major domestic operators. It extracts the basic characteristics of the spatial layout and the sequential connection of functional segments within logistics air routes， and defines a parameterized structural model for logistics air routes. Second， through a literature review， this study summarizes the key factors influencing air route planning， including ground impact risk， weather conditions， public acceptance， and infrastructure. It also examines the main planning methods for en-route air routes and departure/arrival air routes， together with their applicability， advantages， and disadvantages. Third， the study develops an integrated logistics air route planning framework. This framework includes airspace， air routes， and air route networks， covering both en-route air routes and departure/arrival air routes. The findings of this study provide methodological guidance for future theoretical research and practical operations.