Objective To investigate the correlation of functional activities and lower limb muscle mass with muscle strength in the aged sarcopenic men. Methods According to the inclusion and exclusion criteria of Asian Working Group for Sarcopenia (AWGS), 87 men at an average age of (89.5±4.4) years were diagnosed as sarcopenia from those who took physical examination in Outpatient Department of our hospital from June 2014 to February 2015. Their average relative appendicular skeletal muscle mass index (RASMMI) was (6.04±0.62)kg/m2. Physical composition was measured by dual X-ray absorptiometry (DXA), grip strength by a dynamometer named JAMAR, and maximum isometric strength of iliopsoas, quadriceps femoris, tibialis anterior and hamstrings by a dynamometer named FET3. Physical composition, lower limb strength test, 6-min walking test, timed up and go test (TUGT), five times sit-to-stand test (FTSST), and one-legged stance test with eyes closed were performed respectively to investigate the correlations of above indices with the test results. Results The walking speed, TUGT, FTSST, and time for one-legged stance were correlated with age (r＝?0.567, P＝0.018; r＝0.742, P＝0.001; r＝0.632, P＝0.007; r＝?0.489, P＝0.047), muscle mass (r＝0.489, P＝0.045; r＝?0.579, P＝0.012; r＝?0.641, P＝0.003; r＝0.476, P＝0.048) and fat mass (r＝?0.517, P＝0.032; r＝0.513, P＝0.031; r＝0.528, P＝0.015; r＝?0.533, P＝0.012). In addition, the indices of walking speed, TUGT, FTSST, and time for one-legged stance showed correlation with maximum isometric strength of iliopsoas (r＝0.313, P＝0.000; r＝?0.887, P＝0.000; r＝?0.666, P＝0.003; r＝0.515, P＝0.035) and maximum isometric strength of quadriceps femoris (r＝0.251, P＝0.017; r＝?0.775, P＝0.000; r＝?0.612, P＝0.013; r＝0.671, P＝0.002). Conclusion There exists a high correlation of functional activities and physical composition with lower limb muscle strength in aged sarcopenic men. The elderly with high fat content and low muscle mass have relatively poor physical activity, and those with high lower limb muscle strength have good physical activity, especially for iliopsoas and quadriceps femoris muscle strength.