The invention relates to a method and an apparatus for the exhaust gas post treatment of a combustion engine. The apparatus comprises an internal combustion engine comprising a fresh air duct and an exhaust gas duct. A compressor for compressing the fresh air is arranged in the fresh air duct and the downstream of the compressor is provided with a secondary air pipeline. A three-way catalytic converter is arranged in the exhaust gas duct. The downstream of the three-way catalytic converter is provided with a particle filter. The method comprises the following processes: determining a loading condition of the particulate filter, when the loading condition requires a regeneration of the particulate filter, raising the exhaust temperature to a regeneration temperature of the particulate filter by at least temporarily adjusting a mixture formation for the internal combustion engine to a combustion air ratio ([lambda]E <1) and at least simultaneously introducing secondary air into the exhaust gas channel upstream of the three-way catalytic converter, wherein the unburned hydrocarbons in the exhaust gas channel, the super stoichiometric mixing air ratio ([lambda]M> 1) is set in the exhaust gas channel before entry into the particle filter, so that soot is formed on the exhaust air mixture particle filter is oxidized by the oxygen excess.