This is a study on different type of washing on denim fabric and its physical & mechanical characteristics. A series of experiments and investigations help us to determine the properties of Denim fabric, effects of different washing parameters on denim fabric. The textile technologist needs to know the prediction of the aspect of a finished denim look, physical & mechanical properties after different wash with the reality. In this paper we studied the washing effect with the Bleach & Enzyme, in the sector of denim, washes done by different washing chemical & different washing process. Here, all the experimental work done on denim & then analysis those data to show various effect.These effects can be divided into two parts. One is physical (Color Fastness, Dimensional Stability, Stiffness) & other is mechanical (GSM and Tensile strength).