Thank you for reply.
I resolved this issue, i searched the forum, i got solution from here.
i modified product.js (line : 533) file the following lines
$('.jqzoom').jqzoom({
zoomType: 'standard', //innerzoom/standard/reverse/drag
zoomWidth: 300, //zooming div default width(default width value is 200)
zoomHeight: 250, //zooming div default width(default height value is 200)
xOffset: 50, //zooming div default offset(default offset value is 10)
yOffset: 90,
title: false,
position: 'left'
});