Precipitation enhancement experiment was carried out in Minquan County,Henan Province in two years (1991-1992). The antiaircraft guns firing 37mm AgI shells were used to seed the clouds. The seeded rainfall amount consisted of 48 per cent for a year,71 per cent for summer and 99 per cent for July. The historical rainfall data of the experimental and contral area in 28 years were used to analyse the seeding effect. It was shown that rainfall was increased by seeding for 14per cent (172.2mm) for a year. 31 per cent (188.4mm) for sumrner and 45 per cent (103.8mm) for July.