we do a research on the current network status of Bitcoin ，but also this puts forward higher requirements for Bitcoin protocol design . Focusing on the challenges of transaction processing performance 。

Bitcoin is a crypto currency introduced by Satoshi Nakamoto in 2008 .It has the features of decentralization ，， we analyze the feasibility and effectiveness of on-chain scaling proposals .Thirdly ，and the corresponding transaction confirmation time has been greatly increased .Not only this affects user experiences of Bitcoin and limits its usage ，this paper aims to promote blockchain capacity and takes a deep research on Bitcoin protocol .Firstly ，we analyze mechanics and effects of off-chain scaling proposals .Finally ，and analyze the transaction delay according to Bitcoin transaction data . Secondly ，we analyze the advantages and disadvantages of on-chain/off-chain scaling proposals ，the transaction throughput of the Bitcoin network is much limited .Recently ，and propose a scaling roadmap which meets the community requirements . The recent progress on the Bitcoin scaling shows the correctness of our proposals . ，the transaction throughput has been close to the maximum limit ，cross-border and fixed total amount and has become one of the most widely used crypto currencies .Due to some initial limitations set by the inventor and the following developers ，。

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