Abstract: The paper aims to solve the problem of plant dust detain ability. The correlation between detain dust ability of 24 plants in cold region and its impact factors were studied based on multi-dimensional dust quantity/ unit (MDQu) comprehensive analysis method. The results showed that the structure of MDQu former with good consistency were logical, it could effectively reflect the practical detaining dust ability of plants in cold region. Plants with large amount of MDQu in cold region in winter including: Picea koraiensis, Pinus sylvestris var. mongolica, Ulmus pumila, Ovate catalpa and so on. There were significant correlations between detaining dust of plants in cold region in winter and the impact factors such as branch type, growth trend of branch, persistent tissue etc., but the correlations were different because of the specific direction.