The work aims to compare the metaphor mechanisms of Mongolian and Chinese users to the color of mobile phone interface icons with EEG technology, to provide a reference for the cognitive research of inclusive design for ethnic users. Based on CIE chromaticity coordinates, the brain processing of Mongolian and Chinese users on interface icon color was recorded through the matching stimulus paradigm with behavioral experiment and high time resolution event-related potential technology, and the highest matching result, average response time and P300 amplitude of color metaphor matching were analyzed. Behavioral experiments and EEG studies showed that the most common combinations of Mongolian and Chinese bilingual users were blue-blue sky, red-revolutionary, purple-eggplant, green-grassland, black- fierce, white-holy, while the most common combinations of Chinese users were blue-eternal, red-happy, purple-noble, green-trees and black-solemn, white-holy. The higher the frequency of matching, the faster the average response time. The average amplitude of the color semantic P300 of the two ethnic users was different (P < 0.01), and the amplitude was positively correlated with the behavioral experiment. Mongolian and Chinese users have different metaphor mechanisms for recognizing icon color information, so icon design must consider the cognitive experience of different user groups.