I am a rural middle school teacher. In the teaching process, I insist on leading every student to carry out practical activities of collecting and making plant specimens, hoping to improve students' interest in learning. In practice, I found some defects in the method of making leaf specimens used in teaching materials, which affected the effect of practical activities. Mainly manifested in the following aspects: (1) The production process takes a long time: it takes about one week from the completion of collection to the completion of specimen production. Long drying time, slow speed, plants are easy to turn yellow, wither and lose their primary colors. (2) The procedures are cumbersome: it is necessary to repeatedly replace absorbent papyrus, arrange specimens, dry papyrus and other corresponding operations. (3) Plants are vulnerable: During the operation of changing toilet paper, the leaves, flowers and fruits of the specimen will fall off and be damaged. (4) Poor practicability: Even the finished product will inevitably be damaged by external forces such as flowers, leaves and fruits falling off due to operations such as transfer and transfer. The visual effect of the specimen is also not good. (5) Other aspects: It is almost impossible to make specimens of drought-tolerant cactus and Sedum plants. For example, Portulaca oleracea, I found that even after two weeks of repeated drying, the stems were as fresh as ever, while the leaves, flowers and seeds almost completely fell off, leaving only bare stems. In addition, as mentioned above, it is difficult to finish the finishing steps before making the pinnate compound leaves of mimosaceae plants because of dehydration and closure. The main purposes of collecting specimens for students in teaching are: (1) mastering the method of making leaf specimens; (2) Improving students' interest in biology; (3) Know several common plants. Improving students' interest in biology is of great significance to the follow-up teaching of undergraduate courses, which is also the main purpose of teachers' activities. However, due to the shortcomings of the specimen making method used in textbooks, such as long time-consuming, complicated procedures and unsatisfactory making effect. On the contrary, it will make students feel difficult and depressed, thus affecting their interest in making plant specimens, and then affecting their interest in learning biology. In order to overcome the shortcomings of traditional methods of making plant specimens, after years of teaching practice, I have explored a set of methods of making plant specimens for your reference. 1. Features: (1) Fast production: If the weather is clear, it only takes 5-8 hours from specimen collection to production completion, while the actual operation time is only about ten minutes. (2) The manufacturing procedure is simple: only three steps are needed: collecting, manufacturing and removing water. There is no need to replace or dry toilet paper. (3) The finished product has good practicability: the finished product can be reused and is not easy to be damaged. And is easy to store and not easy to be mildewed and eaten by insects. Most of them can keep the original color of plants, and some fern specimens can even keep green for more than two years. (4) Wide application range: Except for a few plant species such as mimosa, it is difficult to make specimens, almost all other plants can be made, and it is also easy to make wax leaf specimens of Portulaca oleracea, a succulent drought-tolerant plant. Even compared with mechanical film pressing method, this method has its advantages. (5) Low cost: The transparent tape used is not expensive, and it costs about 0.07 yuan to make each specimen. Second, the production method: first, materials and tools: (1) materials and tools collection box, branches, scissors, shovels, tweezers, pens, paper cutters, 20cm plastic ruler, wood sponge, hand-held watering can, about 10cm, a roll of transparent tape with a width of about 0.8cm (2) Description of some materials and tools: (a) All tools are a set; (b) The pen is used for writing labels; Paper cutter is used as fine cutting specimen; Plastic ruler is used to help lay transparent tape; Hand watering can be used to clean the soil on the surface of plants. (c) The reference parameter of the board is 40×40× 1.4 (unit: cm). Used as a workbench for field work to complete plant specimens that must be covered with plastic film on site. Composite plate can be used for cutting in the market. (d) The parameters of the sponge are: 15× 15× 10 (unit: cm). It can be used to make the force of pressing samples evenly distributed, and it can also be used to remove the residual water when cleaning plants. (e) One side of the table paper should be white and the other side should be black. In practice, there are shirts lined with cardboard and horse manure cardboard to protect the textbooks purchased by schools. (f) It is ideal if the width of the transparent tape can be 25 cm. If not, it's about 10 cm. Of course, a little wider is better. (g) Second, the specific production steps: (1) Specimen collection: except that some specimens were made in the field and were not brought back to the laboratory for production, most methods are the same as those contained in the textbook. (2) Pretreatment of specimens: Pretreatment mainly includes: (a) Cleaning the soil of plants with a hand-held watering can, and absorbing the residual water on the surface with a sponge. (b) pruning plants. That is, remove some repetitive, irrelevant, insect-damaged, damaged leaves and redundant leaves, fruits and flowers. You can cut off half of the back of the stem that is too thick (C) and shape it, that is, put the plant in a suitable position on the table paper and put the back of a proper amount of leaves outward. After plants are placed and shaped, stress and deformation will inevitably occur, and it is difficult to achieve the purpose of reasonable placement. The fresh plants on the table paper are not on the same plane. At this time, it is still not ideal to press them with a sponge. 0.8cm wide transparent tape can be used to fix the part that needs temporary fixing in the proper position of the table paper. (d) In addition, parts with plant characteristics can be displayed, such as elderberry bark with lenticels and obvious pith, and perilla stem with square cross section.