Effect of pressure on the yield of methane partial oxidation products was experimentally studied under jet conditions at 400°C, 2.8 vol.% oxygen concentration and 30-230 atm pressure range. Water, methanol, formaldehyde, ethanol, acetone, organic acids, carbon monoxide and dioxide were analyzed. It was shown that increasing the pressure above 100 atm slightly effected on the yield of main products. This effect is in contrast with earlier works. The reasons of this fact are discussed.