Abstract: By constructing the “pressure-state-response” （PSR） model, taking Heilongjiang Province as the research area, 17 evaluation indexes were determined from the natural. The land use system health of Heilongjiang Province from 2010 to 2018 was evaluated and the obstacles affecting the system health were diagnosed. The results showed that the change area of cultivated land and forest land was the largest from 2010 to 2018, and the unused land area increased significantly, accounting for 8.82 percent of the total area of Heilongjiang Province in 2018. The health status of land use improved, rising from 0.445 to 0.882 from 2010 to 2018 and the level of land use had changed from “unhealthy” to “healthy”. The main obstacles to the health of the land use system from 2010 to 2018 included land reclamation rate, average land output value, and mechanization level of agricultural land per unit. After 2016, the natural population growth rate, grain output per unit area and the proportion of tertiary industry in GDP had gradually become major obstacles. Among the three subsystems, the system pressure obstacle degree decreased first and then increased, the system state response obstacle degree basically increased first and then decreased, and the system response obstacle degree decreased as a whole. The health of land use in Heilongjiang Province tended to improve, which was conducive to the sustainable development of land use system in Heilongjiang Province.

Key words: land use system health, PSR model, comprehensive evaluation, obstacle degree, Heilongjiang Province