In this study, the influences of the temperature and pH value on the breaking strength of Polyoxymethylene fibers(POM) are studied. POM fibers and regular polyester (PET) fibers are dyed with twenty-three regular disperse dyes, and theirdyeing properties are compared by measuring their dyeing uptake, K/S values and colorfastness. Based on the dyesexamination, POM has relatively lower dyeability than PET in terms of dye uptake and colorfastness. 15 out of twenty-threedisperse dyes on POM fibers have exhaustion higher than 75 % at 1 % o.w.f, whereas 22 disperse dyes on PET fibers hadexhaustion higher 90 % at 1 % o.w.f. Further study shows that the apparent shade depth (K/S) on POM is three times higherthan that on PET when their dye uptake is the same. The dying heat-rate curve of 9 disperse dyes (exhaustion over 70 %) onPOM fibers is also investigated.