Thanks for @PieterGoosen for his help, I found the solution for my problem.
In my functions.php, I construct the next function:
function mod_query($query){
if ( !is_admin() && $query->is_main_query() && $query->is_category('6')){ //My Category ID
$query->set('posts_per_page',2);
}
}
add_action('pre_get_posts','mod_query');
And I needed one file, category-blog.php where I build my html code and use the php code
if (have_posts()){
while(have_posts()){
the_posts();
//.....my code.....
}
}
And my navigation it’s works!
Thanks so much @PieterGoosen for your help.