NOVELTY - In the application of sludge composting, a charcoal as exogenous conditioning agent, is used. The application involves: (1) mixing according to mass ratio of 1:0.2:(0.1-0.3) the sludge, dry straw and charcoal to obtain mixture material; (2) the mixture material into the fermentation equipment through inner static forced ventilation method and artificial forced turning combination treatment sludge composting, where ventilation rate is 0.01-0.05 m3/hour/kg, each 7 days turning one time; and (3) discharging 14-20 days of fermenting material, sifting out the charcoal screening.    USE - As exogenous conditioning agent, in application of sludge composting (claimed).    ADVANTAGE - Compared with the prior art, the charcoal as exogenous conditioning agent can significantly reduce the carbon content of soluble sludge compost, and promote humus aromatic molecular structure, so as to promote composting humification process, and to finally get the sludge compost product of high quality suitable for agricultural; shortens compost period for 1/3 to one half days to achieve reduction of solid waste and recycling; and is safe and harmless.    DETAILED DESCRIPTION - In the application of sludge composting, a charcoal as exogenous conditioning agent, is used. The application involves: (1) mixing according to mass ratio of 1:0.2:(0.1-0.3) the sludge, dry straw and charcoal to obtain mixture material having moisture rate of 60-70%; (2) the mixture material into the fermentation equipment through inner static forced ventilation method and artificial forced turning combination treatment sludge composting, where ventilation rate is 0.01-0.05 m3/hour/kg, each 7 days turning one time; and (3) discharging 14-20 days of fermenting material, sifting out the charcoal screening, where screening rate is more than 80%.    DESCRIPTION OF DRAWING(S) - The figure shows a flow diagram of the process for sludge composting using charcoal as exogenous conditioning agent. (Drawing includes non-English language text).