  We report on the observation of subcycle interferences of electron wave
packets released during the strong field ionization of H$_2$ with cycle-shaped
two-color laser fields. With a reaction microscope, channel-resolved
photoelectron momentum distribution are obtained for different final products
originating from single ionization of H$_2$. Our results show that the subcycle
interference structures of electron wave packet are very sensitive to the
cycle-shape of the two-color laser field. The reason is that the ionization
time within an optical cycle is determined by the cycle-shape of the laser
field. The subcycle interference structures can be further used to get the
subcycle dynamics of molecules during strong field interaction.
