In order to reduce the turbine blade temperature to ensure the safety, the experimental method is used to investigate the flow and heat transfer characteristic of ribbed channel with high blockage ratio, and the influence of several main factors on heat transfer characteristics is investigated for two kinds of ribbed channel with symmetric and staggered ribs. The experimental results show that:(1) The heat transfer coefficients are increased with the increase of Reynolds number, though at the cost of higher pressure losses; (2) when the rib spacing to height ratio is 10, it keeps the highest heat transfer coefficient in three kinds of rib spacing to height ratio 5, 10 and 15; (3) the heat transfer coefficient of symmetric arrangement ribs is higher than that of the staggered arrangement ribs, but the pressure losses of symmetric arrangement ribs is larger than that of the staggered arrangement ribs; (4) compared with one-side ribbed channel, the heat transfer coefficient of two-side ribbed channel is distinctly higher.