In the process of developing and popularizing conservative tillage planting technology of straw mulching,for the problem that currently the work pattern by stages does not make the seeding work with fertlizer(especially for the small row-spacing crops such as wheat) done normally because of the tangling and blocking of the straw, and based on the design idea that before the straw, which is crushed by the hammet-claw and thrown towards inclined back-top side with a high speed crossing the seed-fertilizer box along the wind hole, falls on the soil and the soil is clear and bare, the machine furrows to seed with fertilizer and subsequently the crushed straw spreads over the soil naturally. And the model 9QBF-150/8 of seed and fertilizer'seeder for straw mulching and without furrowing work is developed. The results of field test indicate that: the machine works well; the performance is good; the qualified index of the crushed straw's length is not less than 96.3%; the coefficient of variation of the seed depth is no more than 8.47% and that of the fertilizer is no more than 6.45%. In the test, the tractor power is 36.8 kW, which is the same as that used in the straw-returning machine for the width of 1.5 m. And in the working process, the work load is not increased obviously. Meanwhile, the feasibility and the reasonability of combined work of seeding with fertilizer and crushing straw for mulching are proved in principle and by facts. Although there are some problems in the sample machine which should be improved and perfected,for example, the machine is a little heavier and the center of gravity is a little on the backside.