Abstract: The tussah silk-like polyester fiber was prepared though melt spinning with modified polyester chips. The cross sections, configurations and properties of the tussah silk-like polyester fiber and the tussah silk were investigated respectively. The results showed that the tussah silk-like polyester fiber is similar to tussah silk in flat cross sectional shape, however, its shape uniformity is much better. Compared with the tussah silk, the tussah silk-like polyester fiber has better orientation factor, elastic deformation, resiliency, compliance, coefficient of work, breaking strength and the rate of breaking elongation but lower sonic modulus and plastic deformation. When the constant elongation rate increases, both the elastic deformation and the resiliency of the two fibers decrease significantly, while their plastic deformation rises to some extent.