- Use an SRS software every day (e.g. http://ichi2.net/anki/) - Understand what the individual parts of the kanji mean (http://kanjiabc.net/) - Learn similar kanji at the same time (http://kanjiabc.net/) - Learn words with multiple characters to remember the onyomi (make sure it's really the onyomi) - When learning a new kanji, or reviewing (before you show/look at the answer and after you've seen the correct answer), write the kanji with your finger on a desk (or pen and paper) to get a feel for how you write it correctly. If you got it wrong the first time it'll be harder to make the same mistake again when you've written it correctly by looking at the answer. - The more information you "link" to a character (meaning, onyomi, kunyomi, radical, graphemes, words) the easier it'll be to remember.

you mean kanhi i think by flash cards:)