Metasurfaces have been widely used to generate cylindrical vector beams (CVB) owing to its inherent advantages of high efficiency and compact structure. However, a disadvantage of this method is that the polarization order of the generated CVB is hard to be changed, because the structure of metasurface is fixed. To solve this problem, we experimentally demonstrate a simple and efficient method to manipulate the polarization order of CVB through modes addition and subtraction operation at the working wavelength of 1550 nm. By two cascaded metasurfaces, the subtraction operation of polarization orders is realized. Further, a half wave-plate inserted between two metasurfaces is used to reverse polarization orders, in order that the add computation of polarization orders is realized. Experimental results are in good agreement with the calculation results through Jones matrix, and the polarization order of CVB can be adjusted from -8 to 8 with step length of 2 by modes addition and subtraction.