The biological characteristics of Coloana cinerea Dworakowska was reseached in the laboratory and the field. The results showed that the life-cycle of C. cinerea from Bischofia javanica trees includes more than three generations per year in Zhongshan city of China, and that the generations overlap serious- ly. The nymphs and adults appear any time on B. javanica trees. The eggs lasted an average of （9. 10 ＋ 1.14） days, the larval stages （17.17 ＋2. 09） days, and the adult stages （6.5 ＋0. 56） days in 26 ℃. Over eighty percent of the eggs were distributed mainly in the leaf bases. In general, the damage caused by the pest usually occurred in the first half of the year, the population of C. cinerea reduced significan- fly in the second half of the year.%通过室内外观察，对灰同缘小叶蝉（Coloana cinerea）的生物学特性进行了研究．结果表明，秋枫（Bischofia javanica）树上的灰同缘小叶蝉在中山地区1年发生3代以上，世代重叠现象严重，一年四季可见若虫和成虫同时存在．在26℃条件下，卵、若虫发育历期和成虫寿命分别为（9．10±1．14）d、（17．17．4-2．09）d和（56．5±0．56）d．灰同缘小叶蝉成虫将卵产在叶片组织内，卵主要分布在叶片基半部，占全叶的80％以上．一般在上半年灰同缘小叶蝉为害最烈，而到下半年其危害减弱．
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