Abstract: To improve the yarn evenness, fifty batches of woollen cashmere yarns with the linear density of 38.5 tex were involved. Softwares concerned such as ORIGIN 7.0 were adopted to carry out the correlation analysis. The model of yarn evenness is built. Relashionship between single yarn evenness and roving evenness was investigated,and relashionship between yarn evenness and parameters like thin place,thick place and neps was also investigated. It is possible to indicate that there is a positive correlation between single yarn evenness and roving evenness, meanwhile thin place is the most important factor as far as the evenness of woollen cashmere yarn is concerned. Minor influence of the amount of neps on the yarn evenness is noticed, while the influence of thick place can be neglected. The results provide theoretical basis for improving the yarn evenness.