Abstract: A three-dimensional (3D) pooling operation method is provided. The method performs an operation on an input tensor to generate an output tensor. The input tensor includes multiple input tiles, and the output tensor includes multiple output tiles. The method includes the following steps: reading from an external memory one of the input tiles as a target input tile, and storing the target input tile in a memory; reading from the memory the target input tile; performing a first two-dimensional (2D) pooling operation on the target input tile R times to generate an intermediate tensor, R being a positive integer; performing a second 2D pooling operation on the intermediate tensor one time to generate a target output tile of the output tiles; and storing the target output tile in the memory.