Abstract： Objective To investigate the characteristics of contact allergens in eczema and dermatitis for further diagnosis and treatment. Methods 340 cases with eczema and dermatitis were tested with a standardized screening antigen kit. Results (80. 88% ) of the 340 patients tested had at least one positive allergen among 18 of 20 standardized screening antigen. The first six allergens were nickel sulfate ( 29. 70% ), potassium dichroroate (27.64% ) ,fragrant mix(22.35% ) ,carba mix(20.29% ) ,thimerosal( 18. 82% ) ,benzocaine( 17.94% ). Conclusion Nickel sulfate,potassium dichromate,fragrance mix and carba mix were the main allergens causing dermatitis and eczema presently. Patch-testing was helpful in identifying the property of contact allergens in para eczema and dermatitis.