Two-dimensional imaging of OH and CH intermediates in a premixed flame using natural gas bunsen burner by means of laser induced fluorescence techinique are described. A tunable laser beam with a single laser pulse energy of 1.5mJ is focused by a cylindrical concave lens, which forms laser sheet 5mm high and 0.5mm thick. We have chosen a band near 308nm : OH X2Π(υ=0)→A2Σ(υ=0) excitation and a band near 431nm : CH X2Π(υ=0)→A2Δ(υ=0) excitation. Fluoresence at a right angle is amplified by gated image intensifier and detected by CCD camera. A complete picture of qualitative distribution of OH and CH is obtained by combining several piuctures taken at a series of diffrent distances between the bumer head and laser sheet.