Abstract: At present, data sharing and management of germplasm resources in agriculture field mostly adopts centralized data sharing mode, which has problems of data leakage, easy tampering and so on． According to characteristics of decentralization, safety, reliability, and tamper resistance of blockchain technology, it was proposed a germplasm resources data security sharing system based on blockchain technology with Ethereum framework． In secure blockchain-based germplasm resources data shared system model, an on-chain and off-chain collaborative storage model of "IPFS+blockchain" was put forward for user identity data and germplasm resources data． Asymmetric encryption technology was used to ensure germplasm resources data security and user identity data privacy through interaction of smart contracts． Then, design results of collaborative storage model were given, which was showed that this storage model was rational．