There is practical importance in monitoring pest population dynamics and their regularity of occurrence and development for pest management during grain storage. The regularity of main stored grain insects activity and development were detected by sticky colored card and sample sieving in April at Guangdong Zhenjiang north station transfer grain depot of state grain reserve and Nanning Shajing grain depot. The result suggested that there were species differences of stored grain pests between these two stored grain depots. Liposcelis entomophila (Enderlein) and Cryptolestes ferrugineus（Stephens） seemed to be the mainly pests at Nanning Shajing grain depot, while they were Cryptolestes pusillus（Schnherr） and Liposcelis paeta ( Psocopotera: Liposcelididae) at Zhanjiang north station depot; during April, there were an outbreak of booklice and Laemophloeidae at both of the grain depots, and the population quantity of booklice had rose quickly; the daily activity habit had the obvious correlation with the temperature and humidity inside the barns; the distribution of different stored grain pests at warehouse got effected by many factors and therefore high infected areas were different in different barns. The result showed that it should be pay close attention to pest control as it is the beginning of growth and reproduction for stored grain pests in China's Guangdong and Guangxi in April. And in the process of detection and prevention, it was necessary to identify the main pest species and adjust the monitoring time and means according to the activity regularity of different pests.