The invention provides a bidding and tendering 
information processing method and terminal based on a block chain, a bidding and tendering supervision 
information processing method and terminal, a bidevaluation 
information processing method and terminal and a bidding and tendering 
system based on the block chain. The block chain comprises a bidding node, a bidding node, an expert node and a supervision institution node, and the bidding information 
processing method comprises the following steps: encrypting bidding information, and 
broadcasting the encrypted bidding information to a block chainnetwork; generating an intelligent contract, and 
broadcasting the intelligent contract to the 
blockchain network to extract review expert nodes; and when a bid winning result is received, verifying the bid winning result, if the 
verification is passed, encrypting the received contract file, and 
broadcasting the encrypted contract file to the 
blockchain network. According to the invention, the transparency of bidding and tendering is improved, and heavy loss caused by tampering of bidding and tendering information is avoided.