The realization of supersymmetric standard model in string theory is a very important subject. We have constructed a series of three-family Pati-Salam model. Among these models, we found one is very promising in describing the nature. We found that the gauge symmetry can be broken down to the Standard Model (SM) gauge symmetry close to the string scale, and the gauge coupling unification can be achieved. We also calculate the supersymmetry breaking soft terms, and the corresponding low energy supersymmetric particle spectrum, which may be tested at the Large Hadron Collider (LHC). The observed dark matter density may also be generated. In addition, we can explain the SM quark masses and CKM mixings, and the tau lepton mass. The neutrino masses and mixings may be generated via the seesaw mechanism as well. This is one of the most realistic models constructed so far by Intersecting D-branes in the current research.

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