I have found a variable through which i explain quantum double slit experiment. This variable is present everywhere in this universe .we can not detect this variable because it is very small . Due to this variable elctrons, atoms, molecules, light looks like behave differently. i have explained in detail how this variable and electron effect each other to produce quantum weirdness in double slit experiment. Here i have explained the mechanism .I have explained double slit observing (ii) and with observing . i have explained the interference pattern. And thanku very much.