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To tackle asymmetric information, agent ineffectiveness existing in the service outsourcing industry, the paper takes secondary subcontracting services inside the clusters into consideration, which discusses the effectiveness of incentives in principal-agent model of outsourcing. The game models are put forward. According to the results,the constraints range of incentives that the outsourcing contract-issuing party gives to the service outsourcing contract-undertaking party can be calculated. The incentives which are offered by outsourcing contract-issuing party are invalid and below the lowest bound. Meanwhile, when incentives are above the highest bound, outsourcing contract-issuing party can choose subcontract to maximize its benefits.