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Smart grid has been become a new type of electrical power system.This new system structure physically focuses on expansive capabilities of network operations to coordinate distributed energy resources(DERs).And we present strategies for adapting conventional system simulation methods to the new requirements of complex adapted system.In this paper, we emphasize the steady-state modeling of DERs models in detailed distribution system level and focus on the latest development of cumulative methods and make comparisons with conventional approaches.Distribution system load models are also discussed.And the load modeling of smart distribution is a key problem for smart distribution system modeling to find a reasonable way to represent residential or commercial end-use loads.Top-down and bottom-up techniques are both implemented into loads modeling procedure as aggregated tools.