Abstract: Direct carbonylation of methane on silica-supported palladium catalysts was tentatively investigated by using the temperature programmed pulse reaction (TPPR),constant temperature pulse reaction(CTPR).An important approach is to split the overall reaction into two reaction steps occurring under moderate conditions.Methane decomposition on palladium surface was firstly employed to form surface carbonaceous species.Then the CO syn-gas was introduced to interact with surface carbonaceous species to produce aldehyde.In such a two step route the thermodynamic limitations can be overcome and the direct carbonylation of methane may be effectively achieved.This reaction is an attractively novel route for utilization of methane.Optimization of this process would results in a new route for effective ultilization of methane.