With the continuous development of Internet technology, China has entered a new digital era with higher uncertainty. The literature combines with internet,and digital literature becomes more and more popular,with thousands of internet writers,writers and literature internet becomes a interest community.The goal of contract management is to improve efficiency and resolve the deep-rooted zero-sum game conflicts between the two by agreeing on responsibilities and obligations, so as to maximize the interests of both. On the one hand, digital literature websites need to operate and increase revenue, on the other hand, they need to manage and increase efficiency, and by choosing reasonable contracting methods and contracting time limits, they can maximize the benefits of digital literature websites. Sorts out the types of contracting, and proposes the type of contracting through comparison. Taking the information of online writers who are members of the Chinese Writers' Association as the research object, an optimization model is constructed with the constraint of optimal website cost through the method of mathematical statistics, and measures the optimal contracting years and total cost under the agreed conditions.Some reference suggestions are put forward for the contracting time limit of online writers.