The flow field of two opposed jets was experimentally investigated with the smoke-wire technique and hot-wire anemometer for the stability of impingement plane and stagnation point offset at various nozzle separations and exit velocity ratios.The results showed that at 2D≤L≤4D（where L is nozzle separation and D is nozzle diameter），the impingement plane was instable and oscillated at equal exit velocities，while the impingement plane deviated from the mid-point to a large extent and the flow field became stable comparatively at a small difference of exit velocities.At 2D≤L≤8D，the stagnation position was very sensitive to the change of velocity ratio; while at L<2D or L>8D，the position of stagnation point became insensitive to the change of exit velocity ratio.