Abstract: The rationality of land use structure in Suihua City of Heilongjiang Province from 2010 to 2019 was studied by using the improved TOPSIS method. The results showed that, from 2010 to 2019, the rationality of land use structure in Suihua City was relatively high, and fluctuated. The rationality of land use structure was the lowest in 2010, and the highest in 2017, reaching 100.00%. So, in the future, the land use structure could be adjusted according to 2017. Different land use types had different impacts on the rationality of land use structure, urban and rural construction land had the highest correlation with the rationality of land use structure, the grassland had the lowest correlation with the rationality of land use structure. In 2011, the rationality of land use structure in Suihua City was above 95%, Mingshui County had the lowest rationality, and Qinggang County had the highest rationality, reaching 98.85%. According to the results, some measures were put forward to optimize the land use structure of Suihua City, including controlling the use of urban and rural construction land and transportation and water conservancy land, protecting cultivated land, appropriately developing natural reserves, and adjusting the proportion of forest land, grassland, garden land and facility agricultural land.

Key words: land use structure, rationality, improved TOPSIS method, spatio-temporal analysis, Suihua City