Abstract: A method for photometric determination of formaldehyde in textiles by using m-trihydroxybenzene was studied. By comparing the color of illustrative plates given, one can tell if the amount of formaldehyde in textiles is up to the standard or not easily .The interference color caused by textiles depigmentation in immersion liquid were cleaned up with a column of Supelclean Envl-carb. It keeps good Linearity between absorbancy and concentration of formaldehyde in the range of 0.5～30 mg/kg (r= 0.9991) and proves to be rapid , accurate , practical for the site determination , preliminary screening of large amount of samples or the reinspection of positive samples in the lab.