  A revision of the torodial Kaluza-Klein compactification of the massless
sector of the E(8)xE(8) heterotic string is given. Under the solvable Lie
algebra gauge the dynamics of the O(p,q)/(O(p)xO(q)) symmetric space sigma
model which is coupled to a dilaton, N abelian gauge fields and the
Chern-Simons type field strength is studied in a general formalism. The results
are used to derive the bosonic matter field equations of the massless sector of
the D-dimensional compactified E(8)xE(8) heterotic string.
