分别在2种厚度的PP薄膜（40，50 μm）上以一定间距打不同数量的孔（280 μm），制得了PP微孔薄膜。将PP微孔薄膜（40 μm）制成了自立袋来包装西兰花。通过改变自立袋上微孔的位置，观测袋内气体和西兰花叶绿素含量的变化。结果表明：开孔位置影响袋内O-2和CO-2气体含量；打孔数量为2个，孔间隔2 cm，开孔在西兰花花蕾处时，袋内花蕾处呈低O-2和高CO-2状态，所包西兰花的叶绿素含量最高，西兰花最新鲜；在环境温度一定的条件下，PP微孔自立袋的厚度、开孔位置、孔径和孔数是影响袋内气体含量的重要因素。

The PP micro-perforated films of 40 μm and 50 μm thickness with different number of holes (diameter of 280 μm) in certain distance were prepared. Self-supporting bag was made using the micro-perforated PP film (40 μm) for packing broccoli. Change of gas content and chlorophyll content of broccoli was observed by altering micro-perforation’s position. The experiment results showed that micro-perforation’s position affect the content of O-2 and CO-2; when 2 holes separating by 2cm are punched in the broccoli bud, high O-2 concentration and CO-2 low concentration is produced, content of broccoli’s chlorophyll is highest and broccoli is the freshest. The thickness of micro-perforated self-supporting bag, micro-perforation’s position, perforation diameter and perforation number are important factors influencing gas content in the package when the environmental temperature is certain.