NOVELTY - A silver paste is prepared by mixing and ball-milling slurry-A and slurry-B, where the slurry-A comprises silver powder having particle size of 1-5 mu m, silver powder having particle size of 61-90 nm, glass powder-A and organic carrier-A, the glass powder-A is prepared by using bismuth trioxide, silicon dioxide, sodium oxide, titanium dioxide, calcium oxide, germanium oxide and cupric oxide, the organic carrier-A is prepared by using tributyl citrate, ethylene glycol, carbitol acetate, polyvinyl butyral, silver neodecanoate, alkenyl amide, methyl methacrylate and lecithin.    USE - Silver paste for use in crystalline silicon solar cell back field.    ADVANTAGE - The silver paste has high economic rate, and improved conductivity and improved stacking density of a film, reduces manufacturing cost of a solar cell, and is environment-friendly.    DETAILED DESCRIPTION - A silver paste is prepared by mixing and ball-milling slurry-A and slurry-B, where the slurry-A comprises 45-50 pts. wt. silver powder having particle size of 1-5 mu m, 15-20 pts. wt. silver powder having particle size of 61-90 nm, 10-15 pts. wt. glass powder-A and 15-20 pts. wt. organic carrier-A, the glass powder-A is prepared by using 20-30 pts. wt. bismuth trioxide, 10-20 pts. wt. silicon dioxide, 5-10 pts. wt. sodium oxide, 5-8 pts. wt. titanium dioxide, 2-5 pts. wt. calcium oxide, 2-5 pts. wt. germanium oxide and 1-3 pts. wt. cupric oxide, the organic carrier-A is prepared by using 30-40 pts. wt. tributyl citrate, 15-20 pts. wt. ethylene glycol, 10-20 pts. wt. carbitol acetate, 5-10 pts. wt. polyvinyl butyral, 2-5 pts. wt. silver neodecanoate, 0.5-1 pts. wt. alkenyl amide, 2-5 pts. wt. methyl methacrylate and 2-5 pts. wt. lecithin, the slurry-B comprises 5-10 pts. wt. copper powder having particle size of 1-5 mu m, 5-10 pts. wt. copper powder having particle size of 30-60 nm 5-10, 3-6 pts. wt. glass powder-B and 5-10 pts. wt. organic carrier-B, the glass powder-B is prepared by using 10-20 pts. wt. silicon dioxide, 5-10 pts. wt. boron oxide, 5-8 pts. wt. zinc oxide, 2-5 pts. wt. zirconium dioxide, 2-5 pts. wt. barium oxide, 1-5 pts. wt. alumina and 1-3 pts. wt. silver oxide, the organic carrier-B is prepared by using 10-20 pts. wt. isopropyl alcohol, 5-10 pts. wt. dibutyl phthalate, 5-10 pts. wt. ethylene glycol, 2-5 pts. wt. polyethylene glycol, 1-3 pts. wt. polyvinyl alcohol, 0.5-1 pts. wt. dimethicone and 1-3 pts. wt. vinyl tri( beta -methoxyl ethoxyl) silane. An INDEPENDENT CLAIM is also included for a method for preparing silver paste.