The evaluation and measurement of the beam quality for a high power manufacturing laser were established based on modern laser manufacturing. The measuring parameters, measuring principle, method, equipment and calculation were investigated. Firstly, based on the parameter analysis on distinguishing the laser beam quality at present, the relationship between beam quality and beam width was discussed by taking the beam propagation ratio(M2)and beam parameter product (Kf) for examples. Then, the proper parameters were proposed. Finally,a method based on the object of actual measurement and results were introduced. Experimental results indicate that the Kf value of DC035Slab CO2 laser and TLF6000tCO2 laser are 3.78 mm·mrad and 8.67 mm·mrad, respectively.It is concluded that the Kf value is the calculation results of hyperbolic fitting based on the actual measurement of beam radius at different positions along the laser beam propagating direction,the capability and focus ability of high power laser propagation can be reflected better,which defines well the laser performance for manufacturing systems.