Please send your queries to one of our mailing lists -- galaxy-dev or galaxy-user -- rather than to individuals. That way, more people can see and help you with your questions, you'll likely get a more timely response, and the mailing list archive can serve as a useful repository. Your question about GFF to BED is best addressed to galaxy-user (b/c it's about usage of Galaxy), and your question about Tophat is best addressed to galaxy-dev (b/c it's about setting up a local Galaxy instance). Hence, I've cc'd both lists.

Maybe i can use the tophat anlone.

We've got a Galaxy wrapper ready for Tophat version 1.1+ ; it will likely be available in galaxy-central this week. Once you update your version of Galaxy, you'll be able to run Tophat in Galaxy.

But now i have a another question for giff to bed function.
i want to use gff-to-bed function after i run it, it seems that i got the results :

empty, format: bed, database: ?

Info: 0 lines converted to BED. Skipped 74166 blank/comment/invalid lines starting with line #1.

i am using gff3 file.and it is the first few lines.
##gff-version 3
##genome-build MSU Rice Genome Annotation Project osa1r6
##species Oryza sativa spp japonica cv Nipponbare
##sequence-region Chr1 1 43268879

Chr1	MSU_osa1r6	gene	1903	9817	.	+	.	ID=13101.t00001;Name=TBC%20domain%20containing%20protein%2C%20expressed;Alias=LOC_Os01g01010
Chr1	MSU_osa1r6	mRNA	1903	9817	.	+	.	ID=13101.m00001;Parent=13101.t00001;Alias=LOC_Os01g01010.1

Chr1	MSU_osa1r6	five_prime_UTR	1903	2268	.	+	.	Parent=13101.m00001
Chr1	MSU_osa1r6	five_prime_UTR	2354	2448	.	+	.	Parent=13101.m00001