ABSTRACT: Single batch dry anaerobic digestion (AD) experiments of high solid broiler litter (HSBL) at 37 ± 0.5°C (mesophilic condition) and the inoculum concentration of 40% based on wet weight of HSBL were studied until biogas production stopped or/and was negligible to maximize biogas and methane yield form HSBL by overcoming its obstacles of production. Three different phases of HSBL (first: untreated HSBL, second: ground HSBL, and third: sieved HSBL) were used, and they were diluted by tap water according to the dilution ratios (HSBL: Water) of 1:1, 1:2 and 1:4 (wet weight basis). Then, the mixtures were anaerobically digested using batch operated 500ml reactors. Biogas and methane productions were affected by dilution ratio, grinding and sieving pretreatments. The highest biogas productivity from dry AD of untreated, ground, HSBL was 14.27 NL/kg untreated HSBL and 17.80 NL/kg ground HSBL at the dilution ratios of 1 : 4 for 50 days of solid retention time (SRT) respectively. The highest biogas productivity from dry AD of sieved HSBL was 78.74 NL/kg sieved HSBL from feedstock of 10 ˃ PS ≥ 5 at the dilution ratio of 1:4 for 75 days of SRT. Key words: Broiler litter, dry anaerobic digestion, grinding pretreatment, sieving pretreatment, biogas