Quality of GHG emission from solid waste disposal depends on level of activity data. Activity data of solid wastedisposal is mass of waste disposal and waste composition. Waste composition is one of the main factors influencingemissions from solid waste disposal. According to GHG target management in Korea, uncertainty of activity datadetermined by level of tier. We suggest minimum sample number for analysis of waste composition. In result, we suggestto revise the guideline for GHG target management that minimum sample number for analysis of waste compositionmust be over 73 times during 3 years for total uncertainty of waste composition must be less than or equal to 7.5%(Tier 1 level).