Abstract: This paper describes a new space partition method, which is used in the construction of three-dimensional digital earth simulation system for flight simulation. Through comparing the two space division methods, the same interval and the same area, the space partition method with double longitude span is proposed based on the method of the same interval space partition. The proposed method retains the advantages of the same interval space partition method while significantly reducing data redundancy, and can overcome the problem of the incomplete coverage in visual range.