NOVELTY - A biomass energy cyclic power generation technique comprises: (a) gasifying biomass materials, transforming them to combustible gas, sending to a gas internal combustion engine unit (13); (b) sending the biomass materials or residues generated in the gas power generation process in (a), or mixture of them to a steam boiler (21); and (c) sending the overheat steam generated by the steam boiler (21) and the residual heat boiler (9) in (b) to a turbo-generator unit to generate power.    USE - Process for biomass energy cyclic power generation (claimed).    ADVANTAGE - The invention makes full use of heat and products generated in each processing step in the biomass energy gasifying power generation process to generate power in cycle, which makes power generation rate improve greatly, makes full use of wastes and lowers running cost as well.    DETAILED DESCRIPTION - A biomass energy cyclic power generation technique comprises: (a) gasifying biomass materials, transforming them to combustible gas, sending to a gas internal combustion engine unit (13) to generate power after purification of residues removing and decoking; (b) sending the biomass materials or residues generated in the gas power generation process in (a), or mixture of them to a steam boiler (21) to combust to generate overheat steam, residual heat of the exhausted gas in the gas internal combustion engine unit (13) in (a) is introduced to the residual heat boiler (9) to generate overheat steam; and (c) sending the overheat steam generated by the steam boiler (21) and the residual heat boiler (9) in (b) to a turbo-generator unit to generate power. An INDEPENDENT CLAIM is a biomass energy power generation system comprises a gasification power generation unit (1) having orderly connected gasifier (11), gas purification device (12), gas internal combustion engine unit (13) and cyclic cooling device, where the power generation system also comprises a steam power generation unit (2) having a steam boiler (21), a residual heat boiler (9) and a turbo-generator unit, the tail gas outlet of the gas internal combustion engine unit (13) is connected to the residual heat boiler (9), the gas purification device is also connected to a sewage treatment pool (14), the high temperature residue removing valve for discharging dry residues on the gasifier (11) and the wet residue outlet of the sewage treatment pool (14) are connected to the fuel inlet of the steam boiler (21), the residual heat boiler (9) and steam boiler (21) are connected to the turbo-generator unit after sharing parallel connection.    DESCRIPTION OF DRAWING(S) - The drawing shows the schematic diagram of the process for biomass energy cyclic power generation. (Drawing includes non-English language text.)