This article examines the difficulties of monetary policy in the context of the Democratic Republic of Congo influenced by extensive dollarization in the banking system and institutional weakness. The primordial objective devolve to every government within a given community is to ensure the social welfare of its people. To achieve this goal, governments should develop their monetary policy. One of these is actually a setting of several policies (monetary, fiscal, agricultural ....) all these can be Combined in order to achieve a number of ultimate objectives namely the economic growth, price stability, full employment and external balance whose achievement entrusted to the welfare of the population. In this context, the monetary policy's role is to provide to the real sector the quantity of money necessary for the expansion of the economic activities without generating inflationary or deflationary situations. Indeed, the failure of fiscal policy in the DRC is explained by the tax evasion issues, failure of public finance, and under-evaluation of the tax base. Regarding the monetary policy, its failure is due to the dominance of fiscal policy on monetary policy to the extent that the government of our country remains faithful to financing the budget deficit by the advances from the BCC without any concern of stabilizing the prices.