I present F606W - F850LP (~UV - U restframe) and F850LP - F160W (~(U -
R restframe) color gradients for two samples of early type galaxies
(ETGs) at 1<z_spec<2. Our samples havwe been selected from GOODS-South
field and each one of them includes both normal ETGs having effective
radii comparable to the mean radius of local ones and compact ETGs
with effective radii from two to six times smaller. Colour gradients
in the F606W - F850LP bands have been derived taking advantage of the
ultradeep HST /ACS observations covering the GOODS field which provide
a spatial resolution of about 0.8 kpc at the redshift of the galaxies,
while colour gradients in the F850LP - F160W bands exploit the
capability of the WFC3 images.  Despite the narrow wavelength baseline
covered (1000 A) by the two filters F606W and F850LP, which sample
approximatively the emission dominated by the same stellar population,
we detect significant gradients, both postive and negative, in 50 per
cent of our sample. On the contrary, the analysis of the F850LP and
F160W bands shows high-z ETGs to preferentially have negative color
gradients, with stellar populations much redder in the centers than in
the outskirts.  These first estimates of color gradients of high-z
ETGs represent a fundamental stone to constrain the model of galaxy
formation and evolution.