The paper has researched the influences that crystal conditions of acid eduction from sea-island fiber wastewater have on the quality of recovered TA. The orthogonal test and analysis of variance show that the temperature of the wastewater,the concentration of the acid added,the mixing speed of acid-adding, and the speed of acid-adding,have effects on the results of the experiments when acid is precipitating.This research also probes into the mechanism of crystal in acid eduction through the system mensuration and analyses of the main performances of recovered TA.The paper has also researched some experiments of acid eduction of two kinds of wastewater with different concentration,and surveyed the influence that the changing of the wastewater quality has on the experiments of acid eduction.