l am looking to get either 6 or 12 month chinese visa at consulate in changmai.

Hi, 6 month or 12 months means multiple entry or at least double entries visa. If you had been granted multiple before, it is possible then. However, no one here can ensure you with this, you'd better enquire this with the consular officers directly.

thanks, l just received my new invite letter with her work detail, a copy her c/z visa, copy of p/port details etc,etc and l have my police/security registeration certs from my time here and all is current...when one comes and resides in private accommodation, it is by law you must register and recieve a residential cert and police cert..both have offficial stamps on them..unlike so many others, l chose to do what was right and am so glad l did that..this application will be my 4th one...l heard things go very well in chiang mai..thanks for your imput