I ran an NMR of my compound using CDCL3 but the water peak is tall despite drying for a long time using vacuum pump. How can I eliminate the long water peak
The first question is not how to to eliminate the water peak but why to do this. Such a procedure could be regarded kind of manipulation not in line with research ethics. If there is really good reason, there are several techniques of signal suppression, as stated above (by Guilherme Dal Poggetto ).
Since the water peak must arise from some water present in the solution, it might also be worth trying to dry the solvent itself. This will also "remove" the peak from the 1H spectrum...