Soil carbon dynamics in response to management practices is important to enhance ecosystem services. To evelaute the effects of various combinations of multi-functional  cover crops mix under continuous no-till on soil C sequestration, a field study was conducted was conducted. Composite soil samples (n = 36) from each replicated plot at 0-10, 10-20 and 20-30 cm depth, respectively were collected from (1) contnuous no-till without any cover crops; (2) cover crops mix-1 with Pearl millet-4#, Sorgum sudan grass-4#, Soybean-10#, Cowpea-15#, Tillage radish-2#, Turnip-1#, Sunflower-1#, and Clover-5#; (3) cover crops mix-2 with Sun hemp-10#, Cowpea-15#, Soybeans-10#, Pearl millet-8#, Tillage radish-2#, Turnip-1#, Sunflower-1#, Ryegrass-5#, and Sweet clover-2#; (4) cover crops mix-3 with Tritcale-60#, Austrian winterpea-30#, Vetch-15#, Turnip-2#, Rape seed-5#, and Phacelia-5#; and (5) cover crops mix-4 with Sun hemp-10#, Cowpea-10#, Tillage radish-2#, Tritcale-30#, Pearl millet-8#, Ethiopian cabbage-2#, Soybeans-15#, and Buck wheat-5#. Soil samples were analyzed for microbial biomass C, total, active, soluble and particulate organic C and N and other properties. Using the measured C values, several C management indices (CMI) were calculated. Results showed that cover crops mix-2 followed by cover crops mix-1 and cover crops mix-3 had significantly higher total, active, soluble, microbial and particulate organic C compraed with the control. Cover crops mix-4 did not perform well. Likewise, carbon pool index (CPI), carbon lability (L), C lability index (LI), and CMI values were higher in cover crops mix treatments than the control. When using particulate organic, microbial biomass, soluble and active C as a measure of labile C pools to calculate CMI, the CMI based on soluble C did not vary significant among the treatments. The CMI was more sensitive to continuous no-till cover crop magement practices when active C was used as a measure of labile C followed by particulate organic C and microbial biomass C.