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 In this study analytical hierarchy process approach which uses expert’s knowledge، was applied for selection of the best wastewater treatment alternative for electroplating workshops، located in Tehran province، Iran. This method can be applied for complicated multi-criteria decision making to obtain scientific and reasonable results. Four wastewater treatment alternatives including reverse osmosis، nano filtration، ion exchange، and chemical precipitation were evaluated and ranked based on economical، technical، environmental/ social aspects. Each criterion includes different indices such as land area، capital cost، sludge disposal issues، operating and maintenance، local suppliers and warranty، system flexibility، required skilled and non skilled man power safety، and etc. The results showed that reverse osmosis achieved the maximum general profits and can be the best choice. Sensitivity analysis can shows the effect of inputs parameters change on the results. Sensitivity analysis was applied for each criterion. The results illustrated that for economic and technical criterion، chemical precipitation and for environment criterion، reverse osmosis were qualified.