Abstract: Calculating the green water resources efficiency is of significance for achieving the green development concept and the water resources efficient utilization.We measured the green water resources efficiency in Heilongjiang Province from 2003 to 2018 and analyzed the spatial-temporal evolution using the slack based measure(SBM) model.And the spatial aggregation of the green water resources efficiency through the spatial autocorrelation method.The influencing factors were analyzed by adjusting scenario simulation of input and output variables.The results show that the average green water resources efficiency in Heilongjiang Province is at a low level,but it shows a fluctuating upward trend.The green water resources efficiency in the southern part of Heilongjiang Province has increased greatly,and the efficiency in the northern region has also increased.The efficiency in the eastern and western regions is relatively low and has not changed much.The green water resources efficiency has the characteristics of spatial aggregation.High-high aggregation and low-low aggregation are located in the southern and western regions,respectively,and low-high aggregation is distributed in the eastern region.Water consumption,labor,fixed asset investment and grey water footprint have a negative impact on the green water resources efficiency,while GDP and social comprehensive index play a positive role,and the main influencing factors in different regions are also different.The finding can be used to strengthen regional water resources management and optimize water resources utilization,and further promote the sustainable development of Heilongjiang Province.