A novel optical element is presented for solving the problems that energy of non-diffracting-like linear structured beam generated by normal triangular-section prism is evenly distributed and not suitable to be used to three-dimensional surface measurement directly and energy efficiency of central spot is lower. This element is designed by gluing a platform with isosceles trapezoid section on the bottom of triangular-section prism. The beam transformation property of this element is analyzed with geometrical optics theory, and the conclusion shows that its property is the same as the combination of two normal triangular-section prisms with different bottom corner. When a plane wave illuminates on the novel optical element, non-diffracting-like linear structured beam which has higher intensity in the central spot is formed. Finally the intensity distribution is simulated by diffraction and interference theory. The results show that the conclusion of diffraction and interference theory is consistent with the conclusion of geometrical optics theory, and a better non-diffracting-like linear structured beam is generated by this novel optical element. Parameters that the central spot size of beam, non-diffracting range and so on can be adjusted easily through changing the structural parameters of the prism.