Abstract: To develop functional polyester fiber with antibacterial,anti-ultraviolet,cool and skin-and health care properties,we used the submicronsize particles of ZnO as primary additive in systematic research,made modification and optimization of the conventional polyester production process,and finally determined the production process of functional and cool polyester fiber as follows: functional additive content,4%-6%;spinning temperature,285-(295 ℃;) drying temperature,170-(180 ℃;) and spinning speed:(3 000-)(3 100 m/min.)