  We study the decay of Theta+ in a non-relativistic quark model. The wave
function of Theta+ is constructed for the two cases JP = 1/2+- as products of
color, spin, flavor and orbital parts respecting total antisymmetrization among
the four quarks. We find that for the negative parity Theta+ the width becomes
very large which is of order of several hundreds MeV, while it is about a
several tens MeV for the positive parity. By assuming additionally diquark
correlations, the width is reduced to be of order 10 MeV. It is also pointed
out that a similar calculation for 3/2- results in strong suppression of its
width.
