To solve the poor quality image transmission, this paper proposes a method to improve the transfer rate and reduce error rate of the image by using-MIMO (Multiple Input Multiple Output) technology for capsule endoscopy. In order not to increase the size and power consumption of the transmitting end, we use a single transmission antenna, while at the receiving end, we use multiple receiving antennas, that’s SIMO (Single Input Multiple Output). In the experiments, we simulated the performance of receive diversity techniques, and selected an optimal method of diversity combination.