O One of ways to overcome the solid waste problem primarily the organic waste is the composting way. Compost according to CPIS (1992) is the end product of organic materials after being decomposed. Nevertheless, natural composting needs 6 months period. With environment conditionings (temperature, humidity, aeration, agitation) and EM inoculant addition, composting process can be accelerated into 1-2 months period. With the relatively shorter period, solid waste problem can be handled promptly so it won’t pollute the environment and will have the economic value. The experiments were carried out using organic ingredient such as organic waste, grass, and cow waste with mass ratio 200 kg : 50 kg : 5 kg and with the total mass for each set 255 kg. According to the ingredient composition above, the rasio C/N precomposting is 26. The sets were varied into 4 treatment, divided into 2 composting system, aerobe and anaerobe, each was facilitated with control treatment. In aerobe system composting, the set of ingredient was placed on the bamboo tuiuiel and for anaerobe system, the set of ingredient was covered with plastic. During composting process, the parameters tested in this experiments were temperature changing, humidity, pH, C/N rasio, ammonium and nitrate consentration. Composting maturity can be seen through the parameter measurement where the C/N rasio decreased, NO, concentration increased, and NH4 concentration decreased. In the end of experiment, it was expected to see the influence of EM4 inoculant addition on the decomposition rate from both systems. From the experiment result, it can be obtained that composting using EM -aerobe has the shorter period of time in decomposing the organic waste. The composting process only takes 23 days of time. The use of bamboo tunnel with the size of 1,0 x 1,5 x 1,5 meter on aerobe system gives a real effect in composting process. With the bamboo tunnel available, the oxygen input can disperse throughout the set of pile, keeping the ideal temperature 40°C-50°C constantly for E$ 4 composting where the microorganisms in EM, works effectively in those temperature range. While anaerobe EM, composting, composting time was 52 days, the decomposition rate was slower 29 days than EMS aerobe composting. However, compost quality result for both systems were not so much different from compost quality UDPK method. Based on the experiment, compost quality result for EMa aerobe, the water content : 40,62 %; C-Organic : 25,01 %; Nitrogen (N) : 2,42%; Phosphate (P) : 0,28%; Kalium (K) : 0,63%; and Kation Exchange value (KEV) : 39,25% meq/100 gr. organic material. Furthermore, the compost quality result for EM, composting anaerobe, the water content : 45,13%; C-organic : 23,18%; Nitrogen {N) : 2,54%; Phosphate (P): 0,28%; Kalium (K) : 0,55% and Kation Exchange Value (KEV) : 40,67 meq/l00gr organic material. From the experiment result, it can be concluded that the composting process with addition of EM inoculant aerobe system,using bamboo tunnel can accelerate the decomposition rate of organic materials, with the compost quality result is not much different from compost quality of UDPK.