In fact a complete implementation of the BLAST algorithm is a quite hard. It has a lot of steps and optimizations. What could you do is: take a look of the BLAST Book from O'Reilly, for a very good explanation, take a look of the NCBI Blast code base, that it is big and hard to understand at the first glace, or, I sugest you to take a look at other BLAST implementation or may be, others algorithms like BLAT and Genoogle (http://genoogle.pih.bio.br/)
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事实上，完整实现 BLAST 算法是相当困难的。它有很多步骤和优化。你能做的是：看看 O'Reilly 的 BLAST 书，为了获得很好的解释，看看 NCBI Blast 代码库，它很大而且乍一看很难理解，或者，我建议您看看其他 BLAST 实现，或者可能是其他算法，例如 BLAT 和 Genoogle (http://genoogle.pih.bio.br/)
In fact a complete implementation of the BLAST algorithm is a quite hard. It has a lot of steps and optimizations. What could you do is: take a look of the BLAST Book from O'Reilly, for a very good explanation, take a look of the NCBI Blast code base, that it is big and hard to understand at the first glace, or, I sugest you to take a look at other BLAST implementation or may be, others algorithms like BLAT and Genoogle (http://genoogle.pih.bio.br/)
尝试查看 BioPython：
http://biopython.org/
http://github.com/JoaoRodrigues/biopython/tree/GSOC2010
Try looking into BioPython:
http://biopython.org/
http://github.com/JoaoRodrigues/biopython/tree/GSOC2010