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The purpose of this study is to describe the results of the analysis of Ways of Thinking (WoT) and Ways of Understanding (WoU) of students in solving vector problems based on Harel-s Theory. The analysis carried out was related to Harels Theory and clinical interview based on Interview Communication Map (ICM). The subjects in this study were 50 high school students in Bandung, West Java, Indonesia. This study used qualitative research. The process of collecting data was through literature studies, observations, tests, and interviews. The results found that WoT and WoU of students influence each other. The way of thinking affects students- understanding about a concept which later will influence the way students think in solving mathematical problems. Each category of WoT and WoU was influenced by external factors and internal factors. External factors were the instructional principles mentioned by Harel, while internal factors were local necessity which include self-motivation. So that, WoT and WoU of students in solving vector problems is related and affect each other and also they have unique characteristics.