The COMPASS spin physics program

One of the main aims of the COMPASS experiment at CERN is the study of the spin structure of the nucleon and in particular the determination of the gluon polarization in the nucleon. We present some new results of 2002-2003 data analysis. They concern a precise measurement of the deuteron structure function g1 at small x, some preliminary result on Collins and Sivers asymmetries which are linked to transversity and a new measurement of $\Delta G/G$.