Using the method of rotating needle pinhole, the measuring system which can directly measure the high dense laser transverse intensity distribution of laser beams/focus for laser processing is developed. The mathematical and physical models of measured laser beams/focus propagation in needle pinhole are established. According to the calculation, the system parameters, including aperture of needle pinhole, dimension of propagation channel, dot number of sampling, are given. A new measuring system is designed. The measuring of high power laser beams/focus by this system is realized. The calculation results are of agreement with the measuring results. The instrument can measure CO 2 and YAG laser, measured power larger than 10 kW, maximal measured power density up to 10 7 W/cm 2, measured laser beam maximal diameter is 60 mm, measured laser focus minimal diameter smaller than 0.5 mm.