  We present the results of EVN polarization observations of fourteen
GHz-Peaked-Spectrum (GPS) radio sources at 5 GHz. These sources were selected
from bright GPS source samples and we aimed at finding Compact Symmetric
Objects (CSOs). We have obtained full polarization 5 GHz VLBI observations of
14 sources providing information on their source structure and spectral
indices. The results show that two core-jet sources 1433$-$040 and DA193, out
of 14 GPS sources, exhibit integrated fractional polarizations of 3.6% and 1.0%
respectively. The other 12 sources have no clear detection of pc-scale
polarization. The results confirm that the GPS sources generally have very low
polarization at 5 GHz. The sources 1133+432, 1824+271 and 2121$-$014 are
confirmed as CSOs. Three new CSOs 0914+114, 1518+046 and 2322$-$040 (tentative)
have been classified on the basis of 5 GHz images and spectral indices. The
sources 1333+589, 1751+278 and 2323+790 can be classified either as compact
doubles, and then they are likely CSO candidates or core-jet sources; further
observations are needed for an appropriate classification; 0554$-$026,
1433$-$040 and 1509+054 are core-jet sources. In addition, we estimate that a
component in the jet of quasar DA193 has superluminal motion of $3.3\pm0.6
h^{-1}c$ in 5.5 years.
