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This paper discusses the key problems and processing methods of PIV test in large wind tunnel from five aspects: particle generation and delivery technology, image mosaic technology, reflective processing technology, timing adjustment technology and equipment calibration technology. In order to launch particles in large-scale wind tunnel test, it is necessary to select economic and practical materials, develop sufficient controllable and sustainable supply of particle generation devices, and launch particles at appropriate positions; When stitching large field of view images, we should choose the method of calculating separately and then stitching the velocity field results, and do stitching calibration before image acquisition to obtain stitching parameters; In reflective processing, the best reflective processing method should be selected according to the actual situation. For example, the method of moving camera should be selected, and deformation correction should be carried out in image processing; In large wind tunnel, it is necessary to master fast and efficient timing adjustment and equipment calibration methods to improve test efficiency.