Because the body of old man living alone wears out gradually, under the prerequisite which nobody looks after, become the social worry issue. This research, in order to find the life demand of old man living alone as mainly inquiring, hope to be based on this result, make the life demand of old man living alone to be better. This research divide into four research stages to construct comment scale, deepen interview, Delphi, and Analytic Hierarchy Process AHP. According to assessment factor and mark weight confirmed finally, become the last one ”Grade form of The Lives Demand Assessment for Old Man Living Alone”. According to commenting scales measure actually to 40 old men living alone in Gukeng Township Yunlin County in Taiwan, finally find marks mostly lie between B grade and C grade. Discovering living space and facility are not fit for the solitary old man.