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We have produced Ultracold polar RbCs molecules via photoassociation starting from laser-cooled s5Rb and 133 CS atoms in a dual-species, forced dark magneto-optical trap.The formed electronically excited RbCs* molecules correlated to the Rb(5S,12)+Cs(6P1/2) dissociation limit are observed by trap loss spectroscopy.Following the decay of these excited RbCs* molecules, the formed ground state molecules are directly ionized by a two-photon single-color pulse dye laser, which is a new ionization mechanism for ground state RbCs molecules and thence detected by time-of-flight mass spectroscopy.