The first performance of the no -till seeder is to avoid the stalk blockage while seeding.  To solve the blockage problem,  oversea no-till seeders mostly rely on heavy weight (760-1130 kg/m) or big size.  But those seeders are not suitable for Chinese conditions of small land size,  small tractor and weak left force (300~600 kg/m),  and are expensive as well.  After 10 year efforts since 1990,  light passive anti-blockage no-till seeders were developed and largely applied to the middle and low yield regions.  However,  the anti-blockage performance of the seeders is limited,  difficult to work in the high yield region. From 1998,  3 types of light and active anti-blockage no-till seeders,  strip rotary hoe,  strip chopping and power driven disk no- till seeders,  have been developed.  Those seeders have strong anti-blockage ability, and can directly seed wheat on the heavy maize stalk mulching field.  The unit weight is 316~500 kg/m,  which can matchdomestic tractors. The price is 1/8 of oversea no-till seeders. From the planting quality test of 3 no-till seeders in 2004~2006,  the light active anti-blockage no-till seeders have shown more soil disturbance and power consuming than oversea no-till seeders,  but had advantages of wheat emergence,  seedling growth and wheat yield.  Nearly 20, 000 pieces of the light & high anti- blockage no-till seeders have been applied to the direct seeding wheat in maize stalk mulching field of 400, 000 hm2 in 2006,  resulted resources saving,  environment protection and farmer benefits increasing.