<p>The effort level of edge nodes to perform outward dissemination for short video collaborative caching system in mobile edge is private information. Meanwhile, due to the limited bandwidth used by edge nodes for short video caching data dissemination, the nodes would like to put less dissemination effort to get higher revenue. To address the issue of selfishness in edge collaborative caching systems for short video applications under incomplete information constraints, we design an incentive mechanism based on contract theory. Our proposed mechanism supports pricing for targeted caching services among different edge caching nodes to achieve trade-off between user access requests and caching service supply. We investigate the optimal contract design problem under the budget constrains that short video application service providers can provide. Based on this, the OCSA incentive mechanism is designed with two steps under budget constraints. First, we give the analytic solution without budget constraint. We simplify the problem using the deterministic equivalent method and obtained the optimal solution under the assumption of sufficient costs. Secondly, we transform the contract design problem under cost constraints into a 0-1 knapsack problem and design the contract allocation algorithm for the short video mobile edge collaborative caching system to solve it. The performance of the proposed OCSA is evaluated and it is found that the caching content propagation range of the short video mobile edge caching collaborative system is 20.4% higher than UNI-PRIM and 22% higher than CE-Based.</p>