Yarn pore size and its distribution influence the structural, physical, thermal behaviour and moisture content of the fabrics. Analysis of the microscopic view of cut-cross sectional of yarn is a way forward to measure the yarn pore size and its distribution. The method of yarn sample preparation is important for capturing the cut cross sectional view of different yarns. Three different yarn sample preparation methods were developed for this purpose. Yarn outer and core diameter measurement using microscopic image help to predict the hollow yarn pore size, packing density and linear density. These three methods used to prepare the yarn for cross sectional microscopic study and comparison study was also made. There is a good correlation found among the selected methods.