Abstract: Entrepreneurs have been troubled by the integrating risk in seed industry,both at operation level and psychological level.Different source of merge and integration causes different forming procedure and different mechanism of risk in theseed industry.The risk of seed industry merge，which comes from whole industrial chain，total factor and all participators，is divided into four parts，including sales risk，value-chain reconstruction risk，resource loss risk and risk of insufficient capacity.There will be high risk on carrying on seed industry merge strategy when any kind of risks get some level.The manager should keep high sensitive to the thing,activity or environment which could amplify risk.Risk diagnosis and identification,risk interaction control，internal control,value recognition control,rule control and optimization of strategy are the significant measures to respond to the risk of seed industry merge.

Key words: seed industry merge, merge risk, risk control, value-chain reconstruction, merge optimization