Abstract: Analyzed the relation among some characters of B.napus based on MATLAB, according to the yield character, the sequence of the characters importance was: leaves on main stem>the diameter of root collar>the height of plant>the yield of each plant＞green leaves on main stem>effectively primary branches>secondary branches>corniform pods on each plant>grains on each pod＞the 1000-seed weight, the former 8 characters was extreme significantly correlated with the yield, except for the grains on each pod and the 1000-seed weight. I hope that it can provide theory and practice instruction in B.napus cultivation by them.