Image measurement technology based on linear CCD is an important field in current engineering applications. In view of the contradiction between the current high-precision large dynamic range measurement and the standard linear CCD measurement range and linear CCD geometric structure, a high Linear array CCD measurement splicing scheme with large precision was proposed. The scheme uses the principle of half-reflective half-lens plane reflection to design the optical-mechanical structure principle of the optical splicing system of double-line = array CCD high-precision splicing. The calibration principle of overlapping pixels is given, and the calibration and splicing errors are analyzed. The long-term laboratory experiment results of the splicing system show that the splicing scheme is simple, practical and reliable. The overall splicing error of the system is about 0.019mm, and there is no leakage in the splicing, and the splicing accuracy meets the requirements of high-precision measurement. The stitching scheme has certain reference significance for the practical application of high-precision, large dynamic range CCD measurement.