GB/T 38924.4-2020 "Methods for environmental testing of civil light and small drone systems, Part 4: Temperature and altitude testing" details the requirements for temperature and height integrated environmental testing of civil light and small drone systems (including aircraft and ground stations). The standard includes test conditions, equipment and instrument selection, test process, test interruption and recovery, result evaluation and report preparation. This part aims to evaluate the adaptability of drone systems under the combined action of temperature and altitude changes to ensure that they can operate reliably in actual use. Suitable for drone systems that may encounter temperature and highly integrated environments, to help determine their performance and tolerance under these conditions.