Formation of Galactic GCs with multiple stellar populations in a very gas-rich dwarf at high z. The entire formation process is divided into six steps. STEP 1: formation of massive clumps consisting of gas and new stars in verygas-rich massive dwarf disk galaxies. STEP 2: formation of massive FG systems from merging stellar clumps and filaments developed in these clumps. STEP 3: formation of SG stars from AGB ejecta mixed with pristine ISM in forming FG systems. STEP 4: almost complete destruction of FG stellar systems by the tidal field of GC-host dwarfs. STEP 5: accretion of GC host dwarfs onto the halo region of the Galaxy in the early formation history of the Galaxy. STEP 6: destruction of GC host dwarfs by the strong tidal field of the Galaxy.