SAFEER N

function display_sub_categories() {
	$cat_id = get_query_var('cat');
	$catlist = get_categories('hide_empty=0&child_of=' . $cat_id);
	echo "<ul>";
	foreach($catlist as $categories_item)
	{
		echo '<li>';
		echo '<h3><a href="' . get_category_link( $categories_item->term_id ) . '" title="' . sprintf( __( "%s" ), $categories_item->name ) . '" ' . '>' . $categories_item->name.'</a> </h3> ';
	    $terms = apply_filters( 'taxonomy-images-get-terms', '' );
	    if ( ! empty( $terms ) ) {
	      foreach( (array) $terms as $term ) {
		        if($term->term_id == $categories_item->term_id) {
		           print '<a class="thumb" href="' . esc_url( get_term_link( $term, $term->taxonomy ) ) . '">' . wp_get_attachment_image( $term->image_id, 'full' );
		           echo '</a>';
		       	 }
	    	}
    		echo '<p>'. $categories_item->description; echo '</p></li>';
		}
	}
	echo '</ul>';
}

problem solved with this.