Abstract: The training of logicality in writing English expository articles has long been a key teaching point due to the fact that the expository article serves as the foundation of academic writing. Since the expository article is concerned with the way people perceive and present the world, some theories of cognitive linguistics, which explores the cognitive development of human brain, can be employed to give instructions on the reading and writing of English expository articles. Some integrated studies of cognitive linguistics and English writing can be seen both home and abroad, among which researches targeted at a specific training method of logical thinking and its operational process can hardly be found. Against this background, this paper will utilize color terms, a cognitive theory, to demonstrate a multimodal training method of logical thinking in writing expository articles through text analysis and student composition revision.