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Proceed from economy theory, this paper selects the best treatment method of slopes based on minimum investment principle. In economic analysis, the most important one is to find failure probability of slopes. Traditional calculation method doesn't consider the fuzziness of mechanical parameters. However, the fuzziness exists objectively. In this paper, fuzzy technique is introduced and failure probability is calculated using fuzzy point evaluation method for different slope excavation scheme. So, the results accord with the actual working mode better.