In this experimentation, we used different carriers to research proliferation rate, the physical properties and thermal properties of PLA fibers. To change different carriers and different consistency of carriers to proceed variations of dyeing process, we found that added carriers truly increased the quantity of dyeing on PLA fabrics, especial PSA (Phenyl Salicylate) and NAP (α-methylnaphthalene). In addition, PSA and NAP decrease strength, melting point and decomposition spot of PLA fibers. To add carriers truly increase proliferation rate of PLA fibers.