Abstract: In this work simulation of Double Gate Junction less transistor has been carried out. Comparitive study of the various parameters namely; transconductance(gm), output conductance(gd), DIBL, Subthreshold slope, Ion/Ioff, electric field and Potential. Simulation is carried out in Cogenda Visual TCAD simulator. Comparative study shows using double gate junctionless transistor reduces short channel effect such as DIBL, Subthreshold Slope, Ion/Ioff. Double Gate Junctionless transistor has higher transconductance(gm) and lower output transconductance(gd) compared to conventional junction transistor.