<p>hello friends,</p>

<p>i have a list of GO terms, for example GO:0005975, how i can fine that which of these GO terms is related with cirus fruit senescence please???</p>

For such a general question I would start with http://geneontology.org/ where you can begin a search based on "fruit senescence" (is there such a thing as cirus fruit?, did you mean citrus fruit?), as fruit senescence is more general and you're more likely to find results than requiring a particular type of fruit - unless deep knowledge already exists in that domain. However, this site will simply leave you over at http://amigo.geneontology.org/ where you can explore the relationships among terms and everything else. If you want a programmatic way of doing things - do what Deepak said.