The article explores the application of parallel execution technology in the blockchain domain, particularly how it enhances transaction efficiency, reduces costs, and improves user experience. Solana, as a pioneer of parallel execution, demonstrates its advantages in processing speed and throughput. The article provides a detailed explanation of how blockchain transactions work, including the transaction lifecycle, the role of the mempool, and the operation of blockchains without a mempool. Parallel execution allows blockchains to process multiple non-conflicting transactions simultaneously, thereby increasing network throughput and scalability. The article also discusses different models of parallel execution, including deterministic and optimistic models, and analyzes the teams and projects driving parallel execution in the market, such as Solana, Parallel EVM, Sei Network, Monad, Move language, Aptos, Sui, and Movement Labs.