  In [19] and [26], the authors proved the stability of multi-solitons for
derivative nonlinear Schr{\"o}dinger equations. Roughly speaking, sum of finite
stable solitons is stable. We predict that if there is one unstable solition
then multi-soliton is unstable. This prediction is proved in [7] for classical
nonlinear Schr{\"o}dinger equations. In this paper, we proved this prediction
for derivative nonlinear Schr{\"o}dinger equations by using the method of
C{\^o}te-Le Coz [7] with the help of Gauge transformation.
