A measurement technique of one-dimensional (1D) sub-aperture splicing based on an interferometer with the aperture of 600 nm is proposed. With the analysis of pixel offset error simulation results, a 1D large air-float precision scanning splicing platform is designed and developed, the splicing detection of full aperture optical homogeneity of a large aperture laser glass with a diagonal close to 1 m is realized, and the accuracy and the repeatability of this technique are tested. The results show that the splicing results are smooth, the relative error between the homogeneous splicing and direct measurement results is superior to 2×10 -7, the repeatability of full aperture homogeneity is superior to 4×10 -8, and the largest difference between the measurement homogeneity results of single-aperture and the same region after splicing is 2×10 -7.