Mass-loss rate, the chemical abundance and rotation velocity are the
most important and uncertain parameters in the evolution of a massive
star. The X-ray luminosity of colliding wind binary is highly
dependent on the separation distance of the binary, the mass-loss
rates, and wind velocities. If we know the orbital parameters of the
binary, the X-ray luminosity at an orbital phase should depend on the
mass-loss rates and wind-acceleration parameters. In addition, we
could give the abundance ratio of stellar wind using the grating
spectra. Here I introduce the independent approach of stellar wind
measurement using X-ray observation of colliding wind binary.