20mg/L rutin treatment served as protection by increasing the maximal quantum yield of photosystemⅡ(Fv/Fm) and actual quantum yield of photosystemⅡ(ΦPSⅡ) of shade plants (Spathiphyllum floribundum and Aglaonema modestum)，relieving photoinhibition under strong light．It was deduced that in strong light，20mg/L rutin treatment could play a protective role against photo-damage to the photosynthetic apparatus in shade plants leaves．From the view of mean of Fv/Fm and ΦPSⅡ，Aglaonema modestum standard deviation was higher than Spathiphyllum floribundum，this indicated that measured Fv/Fm and ΦPSⅡof Aglaonema modestum were bigger dispersion during a day，Aglaonema modestum showed more sensitivity to strong light intensity than Spathiphyllum floribundum．
