In a three dimensional (3D) reconstruction system constructed by structured light,the encoding pattern is used to solve the problem of matching corresponding points,which can directly affect the a ccuracy,resolution and real-time of measurement.Structured light pattern based on M array has good characteristics of sub-window and globally unique. By inducing rules complied with structured light pattern,the large size and mul ti-element M array is generated using the improved splicing algorithm.The M array has the property of 2×2su b-window,and 8elements in it. Symbol selection mechanism is presented.By using multi-criteria evaluation met hod,8pattern symbols are chosen.One new single shot binary structured light pattern with resolution of 1024×768based on M array is generated using designed symbols instead of M array elements.The pattern can reduce the number of patterns and avoid the strong interference of environment light.The experimental results show that the decoding algorithm can effectively extract th e information of proposed symbol points in M array,and reconstruct the 3D objects.