A 4-cm-long chirped fiber grating (CFG) with 35 nm bandwidth of reflected spectrum is studied with the exertion of local pressure on the fiber through the application of transverse force to a small grating section. One or several narrow transmission windows can be shaped in the reflected spectrum of the chirped fiber grating. Location and depth of the transmission window is changed with the induced pressure. A physical model is developed in order to estimate the phase shifts induced by pressure. Numerical simulation based on the piecewise-uniform approach is also used to calculate the consequent changes in reflected spectrum. Experimental and theoretical datas are in good agreement.