The invention belongs to the technical field of UAV (unmanned aerial vehicle) aerial survey, and relates to the fixed wing UAV taking-off and landing technology, and the system comprises a database module, and also comprises a measurement area scope determination module, a field survey module, a data processing module, and an aerial survey updating reminding module, wherein the measurement area scope determination module, the field survey module, the data processing module and the aerial survey updating reminding module are connected in sequence. The method comprises a pre-selection step, a step of determining a better taking-off and landing region, and a step of determining an optimal taking-off and landing point. The system and method are high in real-time performance and efficiency, arehigh in precision, are good in control degree, have a dedicated selection step for the fixed wing UAV, quickly achieve the highly precise selection of the taking-off and landing place in a severe andcomplex mountainous region, greatly improve the UAV aerial survey precision, guarantee the safe taking-off and landing of the UAV, greatly reduce the aerial survey cost of the UAV, and are more suitable for popularization.