Marriage Visa

Dearest.. i married in chongqing with local chongqing girl, for more than 4 years now. but 9 months, ago, the PSB start to ask me for Bank statement of my account to support my application for 3 moths visa issued to me, but recently, they ask me to be earning 20.000 RMB every months,. which i have no right to work , but only doing little trading ,Means, every 3 moths of my visa application must have balance of 60.000 RMB. which i always beg them each time, but now, they let me know that with the balance of 60.000 RMB they will reject my visa . so, i was wondering, they want to cut my relationship with my wife and ask me to go back to my country with a baseless requirement which i believe is not from top authority. i live with my wife who is a teacher in county with low income. with our daughter who is just 2years 9 month. i would like to know, if this is Chinese law or individual law. also, i would like to know why they want to separate a happy family.