Abstract: The water soluble trace element fertilizer application result in rapeseed production was studied in this paper,the results showed that spraying ＂surplus feng＂ brand water-soluble rape special trace element fertilizer 200 times,300 times,400 times liquid, match with the conventional fertilization, it got some effect on improving the rape plant resistance, barren flowers,brassica napus and increasing output per unit area,it make an 1.52%-7.53% increase in the rape yield and 496.50yuan/hm2 in income; Considering the comprehensive cost, it is advisable that water-soluble rape special trace element fertilizer 200 times liquid match the conventional fertilization when large area promotion application.