Supersymmetry provides an elegant solution to gauge hierarchy problem as well as a partial solution to cosmological constant problem. In the Supersymmetric Standard Models (SSMs), gauge coupling unification can be realized, the lightest supersymmetric particle can be a dark matter candidate if R-parity is conserved, and the electroweak symmetry can be broken radiatively, etc. In addition, gauge coupling unification strongly implies the Grand Unified Theories (GUTs), which are consistent with string model building. Thus, supersymmetry is a bridge between the promising new physics beyond the Standard Model and the fundamental physics. However, the current LHC supersymmetry searches give strong constraints on the viable parameter space of the SSMs, which leads to the supersymmetry electroweak fine-tuning problem. The natural supersymmetry and the super-natural supersymmetry have been proposed to solve this problem, and we shall briefly comment on their collider searches.