The paper presents and experimentally verifies a new design method of shortening the optical waveguide splitter.Based on the use of BPM simulation, we summarize the relationship between unit central angle and the curvature radius of the bend loss, establishing the monotone arc connection model about all levels between the Y branch of the optical waveguide splitter. We determine the calculation formula about the optical waveguide splitter length, total bending loss, single bend loss and uniformity. In consideration of the whole length of waveguide, bending loss and uniformity, we introduce the design technique of genetic algorithm for global optimization, designing the reasonable and feasible evaluation function. We choose the initial numerical range of the genetic function, and study the genetic algorithm by using MATLAB. Through the verified design on an 1×8 quartz optical waveguide splitter, we find that insertion loss and uniformity index are equivalent,and the effective length is shorten 3.5 mm or more, compared with the existing similar products.