it often gives out a diffusion diffraction hump.If there is strong short-order structure,some simple and casual diffraction peaks may be obtained.These diffraction peaks relate to atomic distances appearing frequently in the disor- dered material.Using Bragg equation: d=1/2·元/sin0 (1) to describe them only has approximate meaning. The theory treatment to radial distribution function reflecting atomic distance Ris),is very complicated.After simplified deduction,to the amor- phous materials made up by chain hydrocarbon such as rubber: R=7/4π·元/sin0=1.11·d (2) This equation means:atomic distancc R appearing frequently produce strong extreme value at angle of diffraction pattern.R is cqual to 1.11 limes as value as d calculated by Bragg equationt6). 1.2 Experimental methods Add 18g (1 sample)copper powder into most primary size compound (2 sample): Natural rubber 200g MBT 1.4g Stearic acid 1.0g ZnO 10g Sulfur 6g obtain two compound sample,roll to slice and cure 30 min at 143C. Experiments were made on Japan Science 12kW rotating anode X-ray diffraction instrument. 2 Results and Discussion 1*and 2*sample's results of X-ray diffraction were shown in Figure 1,2. 2*sample's diffraction peaks were caused by rubber and ZnO.The peaks in amorphous diffusion hump and three peaks,0.94nm,3.116nm and 0.135nm which two samples both had,were caused by rubber.The other peaks were all caused by ZnO (5-664*ASTM card). Among 1*samplc's diffraction peaks,there were 4 peaks caused by copper (4-836*ASTM card),2 peaks by Cu 1,8S (23-962*ASTM card),besides that by rubber and ZnO.The other two peaks,d were equal to 0.1954nm,0.277nm were created by the interactions between copper atoms and rubber molecules. According to equation (2),the atomic dislances R were equal to 0.2169nm and 0.3079nm. 151刀 一 ， 。 二 几 〔 〕 ， 。 ， 了 汀 · 几 · 一 。 〕 。 。 以 。 。 ， ℃ 爪 一 。 ‘ 一 ‘ ， 。 ， 。 ， 。 ， 。 一 。 书 ’ ， 、 一 ， 。 一 ， ， ， 从厂 ， 。 从 。 立