For the purpose of estimating the combining abilities , heritabilities and other genetic parameters, and analysing the relationship between the heterosises of the main fatty acid contents in rapeseed( B.napus) an incomplete diallel crosses design experiment was conducted in 1982-1984. The results showed that the genes display no dominance and act in an additive manner in all fatty acids but stearic, linolenic and eicosenoic acid, which displsy some non-adaditive effect; among these accids, the broad-and nar...