Portsmouth striker Lomana LuaLua was on target for DR Congo
DR Congo beat Guinea 3-1 in a friendly played in Paris on Tuesday.
Both sides used the game in the French capital to prepare for their World Cup qualifying matches next month.
Striker Mbala Mbuta, who has just signed a deal with Swiss first division side Yverton Sport, scored DR Congo's opening goal in the 36th minute.
Portsmouth striker Lomana Lualua scored the Simbas' second goal in the 60th minute.
Guinea got a goal back through striker Ousmane Bengoura, who latched on to a pass from St. Etienne star Pascal Feinduno.
But any chance of a comeback by Guinea was snuffed out by Mputu Mabi, who sealed the win in the 79th minute.
Mabi was at the the receiving end of a pass by Lualua, who dribbled past three Guinean players.
Tuesday's win has boosted DR Congo's confidence ahead of their Group Two World Cup encounter with Cape Verde in Kinshasa on 4 September.
The Simbas lie in third place with 12 points, behind group leaders Ghana and South Africa.
Guinea's Syli Nationale are also in third place in Group Five, behind Morocco and African champions Tunisia.