The transformation of cultivated land use is an important part of agricultural development and transformation and land use transformation.This study discussed the general characteristics of the transformation of cultivated land use in modern agricultural areas,aiming to provide scientific basis for the optimal allocation of cultivated land resources in Heilongjiang province reclamation area to build Sanjiang Authority for the study area.Based on GIS platform,it analyzed the change pattern of cultivated land use pattern of Jian Sanjiang Administration Bureau in Heilongjiang province from 1976 to 2014 in combination with cultivated land use dynamic degree,regional difference index and cultivated land landscape pattern.The results showed that (a) The cultivation of cultivated land in Sanjiang reclamation area can be divided into four typical forms:dispersed distribution,dense distribution,continuous distribution and full distribution.The transformation of cultivated land experienced the period of dry land extension (1976 ~ 1986),Development period of paddy field (1986 ~ 1996),Paddy field extension period (1996 ~ 2006) and Drought-water conversion period (2006 ~ 2004);(b) During the period of dry land extension,the rate of cultivation increased from 19.30% to 47.81% and the share of dry land in the total land area rose from 19.30% to 46.13%.The landscape pattern of dryland showed a high degree of aggregation.At this time,the spatial layout of paddy field appeared as " sporadic" in the study area.(c) The total amount of cultivated land in the paddy field during the germination period was steady,and the increase of cultivated land area was mainly due to the increase of paddy field area,and then proportion of cultivated land in the area occupied by paddy field increased from 3.53% to 6.63%,and the landscape fragmentation rate was higher.(d) The increase of cultivated land in paddy field was stable,and the increase field of cultivated land was mainly from the unused land (marsh),grassland,forest land transformation to the paddy field,at the same time paddy planting advantage was enhanced,and landscape agglomeration increased;(e) During the conversion period,the proportion of paddy field increased from 29.48% to 80.9%,which was mainly due to the change of dryland and paddy field.The proportion of the largest plots in the paddy field increases rapidly,and the paddy fields gradually occupy the absolute dominant position,then gradually from the " fragmentation" to " centralization".(f) Climate warming,landforms and economic benefits were the important reasons for the cultivated land use transformation in the region.But the difference of topography,soil and other natural conditions,and the social development level and traffic location,made the transformation of cultivated land use regional difference.Under the background of global warming and agricultural modernization,its essence was the scale and intensity of investment in agricultural production,gradual expansion of cultivated land and the constant adjustment of its structure.Transformation law of cultivated land use transformation can provide the basis for regional land use regulation.