**Abstract:** This work deals with percolation in coined quantum walks. We use the model
of percolation known from classical physics as an example of disturbance in
quantum walks.
After some introduction to the percolation process we summarize some
published results mainly about spreading of a quantum walk on an infinite
percolated graph.
In the second part we utilise findings about random unitary operators for
finding the long-term behaviour of percolated quantum walks on finite
graphs. The main part of this work is finding possible asymptotic states for
partially percolated quantum walk on two particular finite graphs.