Illustrations in textbooks of science features1. Illustrations for students studying science, scientific inquiry activities provide an important information dissemination of information through symbols, words, images and sounds in many ways. Theory of information technology in education show that the size influence the teaching effects of educational transmission channel capacity. Factors that influence education delivery channel capacity are: signal transmission. Different ways of signaling leads to the time needed to transmit the same content is different, the channel capacity is different. For example, the same objects, describe the students identify required 2. 8 seconds, with color photo student identification is only 0. 9 seconds. Signal transmission. To the same content, different forms, included pictures and vivid, transfer form, channel capacity, on the contrary, small channel capacity. So as a science textbook, symbols, text, and images should be integral and complementary to each other. In this way, as subjects of information processing when using science textbooks, students can access information more effectively.
2. Illustrations created for students to carry out scientific exploration activities on various natural phenomena or things to ask questions is the beginning of scientific inquiry. Creating problem situation is one of four important purposes of book illustrations in a science textbook. Prior to teaching materials in many research activities, arrange a picture illustration students thinking. Also need a variety of scientific inquiry, such as ability to observe, design and capacity, use of appropriate measurement tools the ability to collect, analyze, and interpret data, ability to work with others, ability to communicate scientific processes and results, these capabilities need to be personally involved in the activities in the process of training. The training kit contains a number of illustrations reflect the students ' ongoing observations, experiments, measurements, calculations, discussions and communication scene. Scientific research should also cultivate students ' scientific attitude, that is factual, meticulous, rigorous and serious attitude. Through the relevant figures in the illustrations look, can feel that they are being carried out by scientific research. Model for our students to carry out scientific exploration activities.
3. Arrange illustrations comply with the principle of junior middle school students ' thinking processes, helps students understand the student's learning process starts from the perception. Perception is sensation and perception combined. Feeling is the human brain to act directly on the sense organs reflects an individual property objects. Perception is the human brain to reflect directly on the objects of the senses as a whole. Element of sensation is perception, and perception is formed on the basis of feeling. Perceived process of perceived objects to sensory stimuli, which will stimulate converted to nerve impulses, and then passed by the neural pathways to the specific parts of the cerebral cortex for initial processing. Dale's cone of experience tell us that text content level of abstraction higher, requires students to have strong reading comprehension skills. In junior high school science textbooks, therefore, provide a variety of illustrations as students see the thing at the start of the sensing object, causing sensory stimulation than text objects to direct, intuitive and easy to accept. Because of the beginning of middle school students ' thinking is at a stage of development by thinking in terms of abstract thinking by providing illustrations as visual perceptual objects, is to provide the students the thinking process of material, for correct representation in the thinking process, form a scientific concept, lay the Foundation for cognitive structure of assimilation and accommodation.
4. Design illustrations can stimulate students ' interest in science students ' interest of learning physics is divided into two levels, a direct interest, that is, to be interested in the thing itself, the second is an indirect interest, which are not interested in the thing itself, and more interested in the consequences of things. Interest levels are often at direct interest of middle school students in early stage . Middle school students interested there is also differentiation and selection. Studies show that differentiation and selection of one of the reasons is directly interested in the water. Science textbooks should be written directly through the specific things to stimulate students ' interest. Artwork is the best way to achieve this aim.
5. Quantity involves many areas of illustration can broaden students ' horizon is clearly involve a multitude of scientific illustration, to show students with a science and technology from backward to forward the process, now everywhere and in all walks of life science, everybody needs a science. To help students through science textbook illustrations seen in classrooms outside the wonderful world of science. "Stones from other hills may serve to jade", the experiences of other countries in science textbooks written for elementary education curriculum standards, and for young students, helps students develop teaching materials is our top priority. United States of science textbooks in the illustration style and feature provides some useful enlightenment for us.