First, timely picking buds. Choose mature fruit trees with thick trunks, good fruit quality, and proletarian buds. In the 2-3 days before flowering, collect the appropriate amount of buds that are to be placed on the sunny days with clean porcelain plates and bring them back to the interior. Picking buds cannot be advanced or delayed. Second, meticulous production of pollen. Pick out the impurities and twigs from the collected buds, pour them into a special fine sieve and spread them evenly. Rub the buds gently with both hands, and then remove the impurities by sieving. Place in a ventilated place at about 25°C. Dry it. After the buds begin to crack, pollen is sprinkled, and then finely sieved to remove the flower pedicles and put the pollen into a clean container. Third, according to the proportion of preparation of flower liquid. The flower liquid must be formulated strictly in proportion. The ratio is: water 100kg, sugar 5kg, urea 50g, boric acid 10g, pollen 20g, "6501" 100ml. The preparation method is as follows: first sugar is poured into water and stirred to make it fully dissolved, and 5% of the sugar solution is made, then urea is added to stir it evenly, and a sugar urine solution is formed. In addition, take 5g of water and add 50g of granulated sugar to make a 10% sugar solution. Add dry pollen that has been prepared in advance and stir into a suspension. Use gauze filter to remove fine impurities and finally remove the very pure suspension. Pour into the well-prepared urine solution and mix it evenly with a stick. Then, the pollen solution is made. Fourth, the equipment spray flower liquid. Before spraying, an appropriate amount of boric acid and "6501" spreading agent must be added to the prepared pollen solution, followed by rapid stirring and spraying. Spray time must be selected on sunny morning. It is advisable to open 60%-70% buds of the whole tree. Spray gently with a low sprayer. Because the buds of fruit trees have different opening times, each fruit tree must be sprayed 2-3 times. In this way, pollination will be better. Pollen should pay attention to the current use, usually within one hour after spraying.