Blockchain platform can be regarded as a distributed trusted ledger platform，where distribution is inevitable，credibility is the key，and ledgers are the core. Compared with the traditional software architecture，the structure of blockchain is analyzed，the dividing line of blockchain platform and its application is put forward，and the integrated mortise-tenon structure between them is clearly defined. Then from the ledgers，trusted，distributed and other dimensions，it expounds the related standard of blockchain platform，and offers some engineering proposals for the two specific applications of blockchain platform which are called “fully enclosed type” and “open type”.