A new kind of super absorbent polymers(SAP, superabsorbent) for agriculture and forestry, HA-CMC compound superabsorbent, was prepared by surface cross-linked reaction with humic acid and carboxyl methyl cellulose to improve the shortages of current SAP. The appropriate proportions of different stuffs and the best reacting conditions were optimized, and the characteristics of constituent and surface texture of the compound were studied by the infra-red spectrum and electron microscope. The abilities of water absorption and repeated water absorption of the compound were then compared with other four SAP. The results showed that the most appropriate mass ratio of CMC, MBA, HA, AM and KPS was respectively 1:0.015:0.2:6:0.2. The HA and CMC reacted well and form a kind of powerful-water-holding surface texture which can provide a high water absorption ability. Compared with other SAP, the compound performed well in water absorption and repeated water absorption. The water absorption ability of the compound was better than other three SAP and had no significant differences with Dijin polymers. The repeated water absorbency ability of the compound was significantly better than others.