Abstract: The resource leveling often refers to achieve the balance of resource in one project，yet current aerial enterprises are facing the problem of resource leveling between several concurrent proceeding projects，which is defined in this paper as multi-project resource leveling throughout the whole aerial enterprise.A model to describe such problem is set up in this paper theoretically.Then an artificial immune algorithm is introduced to find a suitable solution，which is improved by mixing the adaptive aberrance arithmetic operators with GA’s cross operation.What’s more，real number coding is used in the computing process.By doing so，the algorithm improves the local search ability and insures the global convergence．Finally，a simulation based on a real aircraft manufacturing project is performed to verify the effectiveness of the method.