Abstract
CDM (Clean Development Mechanism) is regarded as one of the effective measures to tackle the global warming issue. In order to implement a CDM project, Project Design Document which consists of baseline methodology, monitoring methodology and the project specific application, must be approved by the UNFCCC (U. N. Framework Convention on Climate Change). MCF Methane Conversion Factor is inevitable in the calculation of methane generation from anaerobic treatment system. This paper suggests the tentative method of MCF calculation, since at the current situation so little data necessary for MCF determination is available. Thus, in order to develop more applicable and reliable MCF, more observation research are strongly desired.