NOVELTY - A nano silver powder is obtained by mixing and ball milling component (A) and component (B). The component (A) comprises 40-50 pts.wt. silver powder having particle size of 1-5 mu m, 40-50 pts.wt. silver powder having particle size of 16-25 mu m, 10-15 pts.wt. silver powder having particle size of 61-90 nm, 10-15 pts.wt. glass powder and 8-12 pts.wt. organic carrier (a). The component (B) contains 5-10 pts.wt. copper powder having particle size of 6-10 mu m and 5-10 pts.wt. copper powder having particle size of 30-60 mu m.    USE - Nano silver powder is used for silver slurry for forming electrode of solar battery.    ADVANTAGE - The silver powder is free from lead and is environmentally friendly. The solar cell using the silver paste has high stacking density, conductivity and durability.    DETAILED DESCRIPTION - A nano silver powder is obtained by mixing and ball milling component (A) and component (B). The component (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 30-60 mu m, 10-15 pts.wt. organic carrier (a), and 15-20 pts.wt. glass powder (A) comprising 20-30 pts.wt. bismuth oxide, 10-20 pts.wt. silica, 5-10 pts.wt. zinc oxide, 5-8 pts.wt. alumina, 2-5 pts.wt. copper oxide, 2-5 zirconium oxide, and 1-3 pts.wt. magnesium oxide. The organic carrier (A) is prepared by mixing 30-40 pts.wt. isopropyl alcohol, 15-20 pts.wt. ethylene glycol, 10-20 pts.wt. ethylene glycol, 5-10 pts.wt. ethyl cellulose, 2-5 pts.wt. oxalic acid, 0.5-1 pts.wt. oleic acid amide and 2-5 pts.wt. triglyceride. The component (B) comprises 5-10 pts.wt. aluminum powder having particle size of 30-60 mu m, 5-10 pts.wt. copper powder having particle size of 30-60 mu m, 3-6 pts.wt. organic carrier (b) and 5-10 pts.wt. glass powder comprising 10-20 pts.wt. silica, 5-10 pts.wt. boron trixoide, 5-8 pts.wt. bismuth oxide, 2-5 pts.wt. vanadium pentoxide, 1-5 pts.wt. barium oxide, 1-5 pts.wt. tin oxide and 1-3 pts.wt. silver oxide. The organic carrier (b) is prepared using 10-20 pts.wt. isopropyl alcohol, 5-10 pts.wt. propylene glycol monobutyl ether, 5-10 pts.wt. butyl carbitol acetate, 1-5 pts.wt. 1,4-dihydroxy sulfonic acid amine, and 1-3 pts.wt. beta -methoxy ethoxy silane. An INDEPENDENT CLAIM is included for preparation of silver slurry.