In wind erosion research,Bagnold's threshold equation,applicable to determination of relationship between threshold wind velocity and particle size of loose dry sediments,is widely accepted.However,soil moisture is also an active factor influencing the threshold wind velocity because the tension of water molecules will increase the inter-particle cohesion between sediment particles,and hence the threshold wind velocity.To accurately and quantitatively estimate wind erosion and dust emission,it is essential to establish relationship between threshold wind velocity and soil moisture content,but so far the research in this field lags far behind the need of the reality.The review sums up research findings on relationship between threshold wind velocity and soil moisture content in the last five decades,into three categories,i,e.semi-quantitative description,empirical model and theoretical model,and cites some representative examples for each category.Comparison analysis reveals that conclusions of these researchers are various and diversified,especially concerning quantitative relationship,except for the connotation of nature determination.The authors attribute the differences to the lack of a clear understanding of the relationship between inter-particle cohesion and moisture content,definition of threshold wind velocity and moisture content,and physical and chemical properties of tested soil samples.It is suggested that further work be done in this research field.