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Biomethane recovery from paper waste (PW) was achieved by mesophilic co-digestion with food waste. The feeding material containing 0 %, 20 %, 40 % and 50 % of PW in total solids (TS) were investigated in the long-term continuous operation. The results showed that the biogas production, pH, alkalinity and biodegradation of volatile solids (79.8 ± 3.6 %) were stable for PW contents no more than 50 %. The PW = 50 % condition was considered the critical limit for the reasons of pump clogging and sufficient alkalinity (2.0 ± 0.3 g-CaCO₃/L). Prokaryotic diversity indices generally decreased with the increased PW contents. Great shift was observed in the prokaryotic communities before and after the PW contents reaches 50 % as TS (18.4 % in total weights). Biomethane recovery yields were stable yet deceasing from 445 to 350 NL-CH₄/kg-volatile-solids-fed. The PW contents as 40 % in TS (13.1 …